More New Mexico Craters

Much of the academic community assume that a typical catastrophic impact event consists of a single, large bolide. When asked what he thought of the possibility of a cluster impact event of smaller fragments, NASA’s David Morrison expressed doubt. He said he thought such an event would be “highly unlikely”. And since he’s the senior scientist at the NASA Ames Research Center, his views are representative of mainstream planetary science.

But ongoing inventories of the objects orbiting in the Taurid complex are bringing data to light that indicates that, in fact, the last extinction level impact event in the northern hemisphere was probably the work of a very large cluster of debris from a large disintegrating comet, not the kinetic impact of a single, solid bolide.

And in a 2009 paper by W.M. Napier, and titled Comets, Catastrophes, and Earth’s History we read ,

“The evidence that an exceptionally large (50-100 km) comet entered a short-period, Earth- crossing orbit during the upper Paleolithic, and underwent a series of disintegrations, now seems compelling. The idea is not new, but it has been strengthened by an accumulation of evidence from radar studies of the interplanetary environment, from the LDEF experiment, from numerical simulations of the Taurid complex meteoroids and ‘asteroids’, and from the latter’s highly significant orbital clustering around Comet Encke.

The disintegration of this massive Taurid Complex progenitor over some tens of thousands of years would yield meteoroid swarms which could easily lead to brief, catastrophic episodes of multiple bombardment by sub-kilometer bolides, and it is tempting to see the event at ~12,900 BP as an instance of this. Whether it actually happened is a matter for Earth scientists, but from the astronomical point of view a meteoroid swarm is a much more probable event than a 4 km comet collision.”

If Professor Napier is correct, we should expect to find the planetary scarring of a geologically recent super cluster impact event of smaller fragments somewhere in North America.

And in the world according to Google Earth, that planetary scarring does indeed exist. And a good case can be made that New Mexico, and West Texas, were a couple of the major impact zones. But in spite of posting pictures of these ‘enigmatic depressions’ for a couple of years now, none of the mainstream scientists I’ve written to seems to be interested in talking about them. And I haven’t been able to find evidence that anyone has done any real science at any of them either.

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I struggle with the mystery of how they can be so dramatically obvious in satellite imagery, and yet,  no one has gotten curious about them.

Their existence plays hell with the idea that we can estimate the age of a planetary surface by the number of craters we can see in a satellite image.

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Even if they can be proven to have formed by something besides an impact event, we still have a problem. In satellite images they are visually indistinguishable from impact craters. If such geologic features can be shown to have a non-impact origin here on Earth, then what does that say for the very same geomorphology elsewhere in the solar system? Or the idea that you can estimate the age of a planetary surface by counting them?

Which would have the most profound effect on planetary science?

A series of  large crater fields in North America describing the simultaneous impacts of thousands of small comet fragments, with thousands of sports stadium sized craters all the same late Pleistocene age?

Or proof that there is an active geologic process at work in the solar system that can produce thousands of circular depressions with raised rims, that are visually identical to impact craters?

If they are indeed impact craters, then they have a very profound effect on impact threat assessment. And they represent the cusp of a major paradigm shift in impact research. As we move away from thinking of a catastrophic impact event as being the result of the kinetic impact of a single solid body,  to thinking of multiple fragment impact storms of mostly air-bursting smaller fragments.

Are they only sinkholes? Personally, I doubt it. Because if they are, and if any given sinkhole is only part of a larger cave system beneath, then they represent the surface manifestations of a giant, interconnected, cave system stretching across two states, and covering tens of thousands of square miles. It would have be the largest known cave system on Earth. And again, they are visually indistinguishable from impact craters.

If they weren’t formed by impact, then we can no longer assume that identical looking geologic features on the moon, and Mars, were formed by impact either, until we have been there ‘on the ground’.

No one’s talking about them yet. But that doesn’t mean I can’t keep pointing at them.

Here’s a few more.

The map coordinates, view height, and scale, are in the info bar at the bottom of each image.

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If you’d like to see more, I’ve put a few other places in a photo gallery called Crater Field

Published in: Uncategorized on July 8, 2011 at 10:44 am  Comments (5)  

Re-stating a question

In my earlier posts , If not by impact, then what?A few craters more, and The Meteorite Men, and The Odessa Crater, I wrote of the numerous small craters in New Mexico, and west Texas. And the question remains essentially unanswered.

Since none of them have been officially confirmed as impact structures, we’ll just call them ‘enigmatic depressions’ for now. I’ve received quite a few emails from folks about what they thought happened to form them.  And they proposed every thing from inter-planetary electric discharges, to karst collapses, and oil field blowouts.

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But missing from the responses so far, is an answer from a trained geologist, or impact scientist. And in spite of the fact that they are dramatically obvious in satellite image data, I haven’t been able to turn up anything online, or in the literature, that indicates anyone has done any real science at any of them. Although with my limited access to the literature, that may simply be because I haven’t looked in the right places.

I’d like to reiterate the question. But this time I’m hopping to hear a plausible, well thought out, theory from a trained Geologist that describes a  non-impact related process for their formation. And if possible, I hope someone can tell me of some honest science that’s been done on them.

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They are all in the very same geologic condition. Indicating that they are all close to the same age. And they predominate in surfaces, and terrains, that date to the late Pleistocene.

If they are indeed impact craters, then their very existence, and in such numbers, has a profound effect on impact threat assessment. Because that would mean that impact events that consist of large clusters of smaller fragments do indeed happen. And that they have done so in the geologically recent past.  It also means that the ideas that we can assume a steady, and consistent, flux of impacts in the solar system, and that we can estimate the age of a planetary surface by counting the number of craters in any given area become almost childishly naïve.

If they weren’t formed in an impact event, they are none the less significant, and exiting. Because in that case, they demonstrate empirically that there is a geologic process in the solar system that can produce structures which, when viewed in satellite imagery, are visually indistinguishable from impact craters.

And again, the idea that you can estimate the age of a planetary surface by counting the number of craters visible in a satellite image falls apart.

If they’re all karst collapses, and if any given sinkhole is only part of much larger cave system beneath, then we are looking at the upper surface of a vast, inter-connecting, cave system extending over tens of thousands of square miles. And that would make it the largest known cave system in the solar system. Still an amazing, and paradigm shifting, result.

So, again, if those things weren’t formed by impact, then what?

Study the image below closely. Note the over lapping rims in some of them. Overlapping karst sinkholes don’t have raised rims. But overlapping impact craters do.

The image below is the same place in late summer. The red line is 100 meters for scale.

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The shear numbers become apparent when you zoom out to about 6 km.

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Published in: Uncategorized on June 3, 2011 at 7:23 am  Leave a Comment  

If not by impact, then what?

One of the large regions that tweaks my curiosity about impact events in a very big way is an area that extends from eastern New Mexico to just the other side of Odessa, and Midland, Texas.

In the image below we see a small part of that area near Vaughn, New Mexico. Using Google Earth’s historical image feature, we can view the same place from about 15,000 feet, in images taken at different times of the year.nmc51          .

As you can see, there are numerous craters. You get a different set of colors in the late summer.

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The early black & white images are sometimes even more telling.

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These next few are little closer to Vaughn.

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Here it is in the late summer.

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And in black& white.

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Crater fields of comparable fragment sizes can be found in scattered, locally dense, clusters all the way to central Texas.

Anyone can Google up some images of the Odessa crater, in west Texas. But the big mystery I’m struggling with is, what about all the others? In the world according to Google Earth, the Odessa crater is only one of thousands liberally scattered among the oil fields of west Texas. In the image you see below, the white lines are dirt roads about 7, or 8, meters wide. And each of the clearings that show up as little rectangles of a half an acre, or so, are the location of an oil well pump.

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Let’s zoom in close to one of the craters. This one’s almost 190 meters wide.

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The early black & white view is interesting too.

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This one’s interesting too. Three at a time.

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And a classic double ring crater.

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On any other planetary surface in the solar system no one would hesitate to trust their eyes, and call these these what they look like; impact craters.

I asked NASA’s David Morrison what he thought of these things. He expressed his doubts. He said he thought that a cluster impact event would be “Highly unlikely”.  And his views are typical of most mainstream planetary scientists.

But in march 2010, W. M. Napier  published  a paper in the Journal Monthly Notices of the Royal Astronomical Society, and titled, Paleolithic extinctions and the Taurid Complex. In it professor Napier points out that:

“The fragmentation of comets is now recognized as a major route of their disintegration, and this is consistent with the numerous sub-streams and co-moving observed in the Taurid complex.”

And in an earlier 2009 paper by professor Napier, and titled Comets, Catastrophes, and Earth’s History we read ,

“The evidence that an exceptionally large (50-100 km) comet entered a short-period, Earth- crossing orbit during the upper Paleolithic, and underwent a series of disintegrations, now seems compelling. The idea is not new, but it has been strengthened by an accumulation of evidence from radar studies of the interplanetary environment, from the LDEF experiment, from numerical simulations of the Taurid complex meteoroids and ‘asteroids’, and from the latter’s highly significant orbital clustering around Comet Encke.

The disintegration of this massive Taurid Complex progenitor over some tens of thousands of years would yield meteoroid swarms which could easily lead to brief, catastrophic episodes of multiple bombardment by sub-kilometer bolides, and it is tempting to see the event at ∼ 12,900 BP as an instance of this. Whether it actually happened is a matter for Earth scientists, but from the astronomical point of view a meteoroid swarm is a much more probable event than a 4 km comet collision

Most of the academic community assume that large clusters of cometary debris don’t hit the Earth. At least, not in the geologically recent past. And when looking for answers, the typical response for those in New Mexico is that they are all probably karst sinkholes, because they are all in limestone.

But there’s just too darn many of them. Any given karst sinkhole is representative of a partial collapse of a much larger cave system beneath. And if we work from the gradualist postulate that these holes in the ground appeared, over a great span of time, our thinking is still stuck in a box.

There are many thousands of them, in many different terrains, and all in exactly the same almost pristine condition. They can be found in numerous large clusters, in a variety of sizes in a vast region that includes almost all of eastern New Mexico, and West Texas. And they average about 100 meters in diameter.  

Take your pick. Which is more plausible? A giant series of inter-connecting cave systems covering tens of thousands of square miles, with too many large sinkholes as big as a large sports  stadium, all breaking the surface, and collapsing, at nearly the same time to count? Or the giant crater fields caused by the almost simultaneous, late Pleistocene – early Holocene impacts of a cluster of cometary fragments from the Taurids?

I’ve been asking around, and digging  for evidence that someone has actually done some real science on these things. And all I’ve been able to get are wimpy answers that begin with; “Well, most geologists agree that______”, or words to that effect. Heck, I don’t care what they’ve all decided to agree about. I want to know what evidence they’ve dug up. Can someone tell me who has done some science there?

As for me, and until proven otherwise, I prefer to trust my own eyes. Those surfaces we see those things in all date to the late Pleistocene. And I’m working from the postulate that they are related to the impact storms of the Taurid progenitor.

There’s a few more to be seen in this gallery called Craterfield.

Published in: Uncategorized on May 16, 2011 at 12:39 pm  Comments (2)  

North Central Mexico, and the planetary scarring of a Multiple Air Burst, Impact Storm

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In his map, and text, titled Geologic Map of Manuel Benavides area, Chihuahua, Mexico. Map and Chart no. 99, Geologist F. W McDowell assumes without question that only terrestrial volcanism can melt the rocks of the Earth. And this is how he describes the Benavedes structure we see above:

“The caldera is an unusual trap-door type with a hinge zone on the southwest and two separate collapse and eruption margins around the north and east. Its outer diameter is approximately 25 km, which is unusually large for the tuffs that erupted from it, suggestive of a shallow collapse. Inflation or tumescence prior to the eruptions modified a preexisting Laramide fold by bowing it outward toward the north and east; a 31.5 Ma granitoid was intruded into the fold axis, resulting in the formation of skarn deposits in the surrounding limestones of the fold.”

Being well grounded in uniformitarian/gradualist geologic theory, the very idea of a very large, multiple fragment, geo-ablative airburst event would never have occurred to him. But one critical thing that McDowell’s work does not mention is that no seismic, tomographic, or ground penetrating radar, data exists that support his unquestioned assumption that there is a volcanic vent, or magma chamber, at this location. He also fails to describe the crazy mantel physics required for a 17 mile wide, perfectly circular, “hinged trap-door” vent.

Mr. McDowell puts the age of the event at 31.5 million years ago. But the age of an ancient, and exposed, vein of intrusive granite is not a measure of the age of the perfectly pristine ignimbrites blanketing the terrains in the region as the undisturbed capstone.

It will be seen that his estimate 0f age for the emplacement of those materials is probably over-estimated by orders of magnitude. And that close examination of these, and related terrains of the region, reveals the existence of a very different kind of catastrophe from anything any geologist of the past would be capable of imagining. At least, not from the safe, and comfy, uniformitarian/gradualist-assumptive, geophysical paradigm the Earth sciences have used without question, as the foundation of their thinking  for more than 150 years.

The unquestioned assumptions that only terrestrial volcanism can melt the surface of the Earth, or that all geomorphology in the past was the work of  uniform, and gradual, forces we see going on around us today, and ‘The present is the key to the past”, are as hopelessly naïve as flat world theory, or a children’s bedtime story.

Using modern satellite imagery, a very compelling case can be made that Benavedes is on the northeastern edge, of the primary impact zone of a very large, multiple fragment, geo-ablative airburst, impact storm. And that the event happened on a continent wide scale of terrestrial violence that no one on Earth could have conceived of at all until we all saw the fragments of Shoemaker-Levy 9 hit Jupiter.

I propose that the Benavides structure is not volcanogenic at all. And that it is, in fact, a very different kind of geo-ablative airburst astrobleme. Furthermore, a very good case can be made that it was produced by a few of the larger fragments to fall in a vast cluster, about 500 miles wide, of large, air bursting, comet fragments that hit central Mexico, and west Texas, over a period of only a few seconds, and just a few thousand years ago.

The impact zone is defined as the green oval in the image map below. Most of the examples I present from the Chihuahuan Ignimbrites are within the area circled in red. Benavedes represents a very small part of the overall violence. And it can be found just to the right of the center of the red oval.

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The first thing that caught my eye about the Benavedes structure was that 17 mile wide ring. And the smaller 8 mile wide ring superimposed over it. I saw a very large explosion do something like that a long time ago in the Army, in a training film; albeit on a much smaller scale.

They were showing us examples of different kinds of explosions, and their resulting ground effects. And in one example, a very large, very fast falling, bomb detonated above ground at just the right height to make a ring structure like that. The speed of the falling bomb was about the same as the speed of the expanding detonation shockwave. So that when it detonated just above ground like that, the downwards momentum of the bomb was coupled in with the pressure of detonation shockwave. Instead of a crater, It concentrated the overpressures at the edge of the shockwave. And that shockwave cut into the ground like a giant cookie cutter.

So we see the 17 mile wide, surface compression shock ring from the giant, above ground, explosion of a falling object. But look closely, we also see the shock ring of a smaller explosion about 8 miles wide superimposed over the larger one. So we know we’re looking at the blast effected materials of multiple blasts.

The big one came first. It’s blast wave scoured the ground down to bedrock inside the circle. And the resulting geo-ablative materials were thrown outside the circle. And it’s the lack of symmetry to the emplacement of the resulting ejecta that’s our first clue that we are looking at only a small part of a much larger event.

Notice the character of the materials in the arrowhead shaped splash of ejecta blown to the northwest. It was laid down in the first blast that also produced the larger ring.

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It is perfectly clear that these materials were airborne at the moment of emplacement. This melt didn’t flow along the ground like a lava flow. It flew there in a giant splash of ejecta. And when you zoom in closer, you’ll see that the individual splashes of melted rock are perfectly pristine.

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Zoom in as closely as you like. You’ll see that, since the time of the emplacement event, when this melt splashed down here, there is no sign of weathering, or decomposition of the individual splashes of melt at all .

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There might be a vein of 31.5 million year old intrusive granite exposed in the Benavedes structure. But the age of that ancient, and exposed granitoid intrusion is not a valid indicator of the age of the perfectly pristine splashes of melt blanketing the surface terrains of this 10 mile long splash of ejecta.

The second explosive pulse produced the smaller 8 mile wide surface compression ring on the northern edge of the larger ring. As well as the shorter ejecta curtains on the north, and east of the structure.

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The white line is 1 mile for scale. The way those flows can be seen to have inter-fingered as they collided, at the ridge tops, and leading edges of the flows is consistent with a very fast emplacement of the entire blanket of melt in only a few short seconds.

As with the materials in the Arrowhead shaped splash. These blankets of melt did not look any different when they were still fresh, hot, and smoking.

Mr. McDowell assumes an age of 31.5 Million years, based on the age of the rock that granitoid intrusion. But there is no valid reason to assume that the age of that ancient, and exposed, vein of intrusive granite is the same as the perfectly pristine surface melt formations, that were formed, and emplaced, there. And in spite of the assumption of ancient age, there is no visible sign whatsoever of weathering, or decomposition, in the flow features of the upper layers of melt.

There is no such thing as immortality.  Even the rocks of the Earth crumble to dust after a few million years of exposure to the elements. And since the time of their formation, and emplacement, the stone in the melt formations at Benavedes is in much better condition than the stone we see in the monuments, and ruins, of bronze age Mediterranean civilizations. And those rocks are only a few thousand years old.

But why are the blast effected materials of this explosive event so directional? Ejecta from these blasts flew more than 10 miles to the northwest. What happened to the ejecta on the opposite side of the ring structure? Why didn’t they fly just as far? Stay with me here. I’ll get to that.

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Mr. McDowell can assume the Benavedes structure is a volcano if he must. But the simple, empirical fact, is that only impact events make mega breccias. Only giant impact events make mountains of them. And outside the southeast edge of the ring shaped valley of the 17 mile wide shock ring we see that the ejecta has piled up into mountains of mega breccias almost 1000 feet high.

The question of the cause for the directionality of the ejecta from the blasts will begin to make sense as we look further outside the circle.

But first, lets recap.

At Manuel Benavedes we see the detonation shock-ring of an above ground explosion hot enough, and powerful enough, that it ablated much of the surface inside the circle down to bedrock. And the heat, and pressure, of the expanding detonation shockwave pushed the resulting geo-ablative ejecta outside the circle.

But the blast pattern of this explosive event is extremely directional to the northwest. The ejecta on the northwest side of the blast flew more than ten miles. But on the southeast side, on the opposite side of the blast, the momentum of the ejecta was met by a force that was powerful enough to neutralize that momentum, and stop it in it’s tracks just outside the edge of the detonation shockwave.

So what we can say so far, is that at Benavedes we see the blast effected materials of an above ground explosion powerful enough to excavate a 17 mile wide area down to bedrock. The surface compression shockwave of the blast cut into the ground like a giant cookie cutter, forming a 1000 foot deep valley in the bottom of the resulting ring shaped depression.

Yet for all it’s power, the blast effected materials of that explosion were blown more than ten miles to the northwest by a wind already blowing from the southeast with enough force to blow the blast effect materials produced in that explosion aside like setting off a firecracker in a hurricane.

Note the ablative patterns in the mountains just west of Benavides. The arrowhead shaped splash is just off image to the right.

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The mountains in the bottom right are broken down like clumps of flower on a baker’s table. And the geo-ablative patterns of fluid flow on the mountains in the center of the image are dramatic, and obvious.

The pressure of that geo-ablative wind stood up mountains of mega breccias on the southeast edge of the Benavedes ring. The blast wind was powerful enough to knock down whole mountain ranges like clumps of flour on a bakers table. And with enough heat to ablate into them in places like a high pressure blowtorch would cut into a chunk of wax.

In the 1920s, when Harlan Bretz first noticed the patterns of fluid flow in the “Channeled Scablands” of eastern Washington, the patterns he noticed in the aerial photographs were like the ripples you see in the sediments on the bottom of a stream bed. But the ‘ripples’ in Washington are hundreds of feet high. And they were produced by a glacial mega flood.

The mountains below are just south of Benavedes. These mountains raise the ante on catastrophic violence by an order of magnitude from what Bretz was able to see in photos taken from blimps. From about 15 miles up. We see the familiar patterns of fluid flow we would expect if something flowing across a surface left the signature of its movement, like those ripples in a stream bed. But these ‘ripples’ aren’t 2” tall in a stream bed, or even 200 ft tall in a giant flood channel, like the scablands of eastern Washington. This range of mountains rises about 1ooo feet above the surrounding plain.

It wasn’t water that flowed over these mountains. And they aren’t eroded. They were ablated, and deformed, this way by the same impact storm wind that deformed the Benavedes blast, and burned its ablative signature into the mountains shown in the image above like a blowtorch cuts into wax.

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Note the compass symbol in the upper right of the image. North is to the right. When you go looking for the source of that prevailing southeast to northwest hyper thermal blast wind, and you begin to study the full extent of the catastrophe these blast effected materials describe, in addition to many examples of the geomorphology of  A thermal airburst impact structure, you’ll come to places like the one 80 miles south by southwest of Benavides where a large fragment of rock tossed from the Benavedes blast, landed in the still soft melt. That location is described in detail on the page titled An impactite in the melt.

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There is much to be learned by the character of the pathway that impactite made as it slid through the still soft melt. And we can see in the patterns of flow in the melt alongside its path, that the ignimbrites weren’t quite solidified at the moment that rock gouged a path through them. But the direction of flow we see frozen into the melt along that path, was at right angles to the path of the rock. And there is no deformation of the path itself. So we can know that the melt was still soft, but no longer in motion, at the moment the impactite hit.

By their very nature, the ignimbrites that thing landed in were themselves, deposited in a very fast, wind-driven, pyroclastic density current that had a velocity of hundreds of miles per hour.

As a wind-driven density current, they were only in fluid motion as long as the particles, and fragments of ablative melt remained in atmospheric suspension. And after the last of the ablative airbursts fell, the melt would’ve only been in fluid motion for a few scant seconds before coming to rest. Like the debris from an avalanche that sets up like concrete as the cloud of snow, and ice, comes to rest. The ignimbrites would have begun to solidify very quickly as well.

In other words, the possible time window for the still fresh ignimbrites to be stationary, yet still soft enough for the impactite to make a path through the melt like it slid through wet mud is very small. A few seconds at most.

There is no visible sign of post impact melting of the features of that rock, or the gouge it made through the melt as it came to rest. So like the final note in a vast symphony of fluid motions, it can be thought of as a temporal marker. The path of the impactite marks the exact moment of the last few seconds of the air burst impact storm that formed, and emplaced, the Chihuahuan Ignimbrites. And the perfectly pristine condition of the materials around it as the undisturbed capstone of the terrains, since the time of their emplacement, gives us a very strong indication that whatever else these geo-ablative ignimbrites, and their related terrains are, geologically old they’re not.

An important thing to keep in mind is that, no matter whether a piece of ‘ignimbrite’ is truly volcanogenic, or if we can conclude an ET origin, either way, such materials are always the product of a violent explosive event. And as the blast effected materials of an explosive event, the patterns of movement, and flow, that get frozen into them during emplacement can reveal much of the true nature of the explosive event that put them there.

I don’t want to digress into a discussion about volcanoes. But it’s important at this point to understand the internal structure of these kinds of materials, and how they move during formation, and emplacement. And why it might be easy for geologists of the past who could never have imagined such a thing as a geo-ablative airburst impact event, to get volcanic tuff, and airburst melt, confused. It’s time to put on your fluid mechanics hat.


FLOW FLUIDIZATION

From How Volcanoes Work

The extraordinary velocity of a pyroclastic flow is partly attributed to its fluidization. A moving pyroclastic flow has properties more like those of a liquid than a mass of solid fragments. It’s mobility comes from the disappearance of inter-particle friction. A fluidized flow is best described as a dispersion of large fragments in a medium of fluidized fine fragments. A constant stream of hot, expanding gases keeps the smallest of the fragments (ash and lapilli size particles) in constant suspension. This solid-gas mixture can then support larger fragments that float in the matrix.

The image below below is a section of the Ignimbrite flows about halfway between Benavedes, and El Paso, Texas. The eye height is about 46,000 feet. And the area of the image is about 10 miles wide.

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The direction of movement is from left to right in the image. The clearly legible patterns of flow that were frozen into these pristine pyroclastic materials  at the moment of their formation, and emplacement, don’t make any sense at all if we assume without question that they’re volcanogenic.

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All mass movement across the surface of the Earth requires a motive force. These materials are on nearly level ground. So gravity pulling a pyroclastic flow down a slope, and away from a vent, was not the motive force in the emplacement of these pyroclastic rivers of stone. And while in motion, they didn’t move from areas of highest elevation to lowest.

Study them closely. Those are wind-driven patterns of movement, and flow. Using modern 21st century imagery, we can zoom in close enough, and with high enough resolution, to confidently assign a directional vector to every square meter of those ignimbrite sheets. We can see how it moved as easily as determining which way spilled paint flowed. And we can study the emplacement like reading a dance chart. The rivers of geo-ablative melt were ablated from their parent surfaces, and driven to the locations where they came to rest by the geo-ablative down blasts of the impact storm, like the debris laden froth, and foam, on a storm tossed beach. They moved from areas of highest atmospheric pressure to lowest.

In north central Mexico, and in the Sierra Madre Occidental Mountains to the west, there are well over 350,000 cubic miles of pristine ignimbrites like this. Less than 15% can attributed to a volcano. And as we can see in these images, a careful study of the patterns of movement and flow in the ‘orphaned’ ignimbrites, clearly reveals wind-driven patterns of flow

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But they weren’t all airbursts. Here we see where a couple of the fragments, hit, and exploded at ground level. They left star fractures in the bedrock like rock dings in a windshield, and disrupted the flow patterns in the emplacement of the ignimbrites. So we know they happened during the emplacement event. If you spend a few thousand hours studying the emplacement of all of this melt, you’re sure to run across a lot of impact fractures like these. along the way.


In the image below we’ve zoomed in closer to an altitude of about 26,000 feet. And the patterns of flow are getting easier to read.

I often use the comparison, ‘Like the debris laden froth, and foam, on a storm tossed beach.’ Here you can begin to see why.  The direction of flow is from the bottom left, to upper right.

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The detail in the image map above shows that using satellite imagery we really can map the directionality of these flows to a resolution of 1 meter per pixel.

A gravity-driven pyroclastic flow of volcanic tuff moves from highest elevation, to lowest. But a wind-driven pyroclastic flow of ablative airburst melt moves from areas of highest atmospheric pressure to lowest.

During their emplacement, and while they were in motion, the ignimbrites could be thought of as an unconstrained, fluid. Since the motions of an unconstrained fluid are defined by the forces that move it, then when those lines of flow become frozen into rivers of flash melted stone, the patterns of motion become a permanent, and faithful, record of the forces that melted, and moved them.

With an overlay that assigns a directional vector to each pixel of image data in the impact zone, our image map becomes a flow map. And a very highly detailed barometric pressure map of the violently hot, and turbulent, atmospheric conditions driving the formation, and emplacement, of all the melt in North Central Mexico, and Southwest Texas.

The long standing mystery of the source vents, and magma chambers, for all these pristine rivers of flash melted stone, is resolved in the profoundly simple realization that there aren’t any. They didn’t come out of the ground. The sources of all the ignimbrites are simply the barren, ablated, areas behind them where there are no ignimbrites.

And like the melt formations at Manuel Benavedes, the heat, and pressure, to melt, and move, them didn’t come from below either.

A Few Craters More

If the best place to hide a tree is in a forest, then where do you think would be the best place to hide a very large field of craters averaging about 100 meters diameter? And all about the same age? Believe it or not, it’s not hard to do at all. Especially if the people you want to hide your craters from are skeptical that catastrophic impact events happen at all.

Most geologists assume that a cluster impact event is ‘Highly Unlikely’. But you won’t hear that from an astronomer. In fact, the fragmented nature of objects like comets Linear, or SW –3, implies that most catastrophic impact events are probably the work of a large cluster of smaller fragments, instead of a single large bolide.

It turns out the best place to hide a large field of small craters is right out in plain site.

Sometimes it seems that geologists will entertain almost any conceivable theory to explain round holes, or depressions in the ground as long as the theory does not mention impacts.

So, if something like the cluster of fragments were see in the images of comet Linear were to have hit somewhere in North America in the geologically recent past, the resulting planetary scarring would’ve been completely overlooked, or mis-defined by generations of geologists. Geologists who, until we all saw SL-9 hit Jupiter, didn’t believe that such violence can possibly come from above. Or that cluster impact events happen.

nmc30

If your target surface is limestone, they’ll assume without question that the resulting craters are all karst sinkholes. And they won’t even look twice. Especially if they don’t have access to aerial photography.

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But when we look at them from high altitude, we can see that the number, and distribution, of them, all the same age, debunks the theory that they’re all merely sinkholes.

nmc9

If you saw a large field of perfectly circular depressions like these anywhere else in the solar system, no one would hesitate to call them impact craters. It is only here that they are denied.

As I understand the standard model, objects in the solar system, including the Earth,  are thought to be subjected to a steady flux of impacts. So, if they were to look at a crater field like the one you see above, on the moon they’d assume without question that it took millions of years for so many craters to form.

A very large cluster impact event hitting the ground like a giant shotgun blast of smaller fragments has always been inconceivable to standard thinking. But the simple empirical fact is that these craters do exist. They are all in the same excellent condition. And crater fields of similar proportions to the ones we see in Eastern New Mexico exist in a broad variety of terrains all the way to Odessa, and Midland, Texas. Check out The Meteorite Men and the Odessa Craters for images of some of the ones in west Texas.

There’s a few more images in a gallery here.

In the world according to me, the idea that you can estimate the age of a planetary, or lunar, surface by the counting the number of craters is absurd.

Published in: Uncategorized on May 2, 2011 at 1:19 pm  Comments (2)  

A Different Kind of Climate Catastrophe

A couple of years ago, as a hobby, and pass-time, I set out to see if I could work out a better way of identifying potential sites to go meteorite hunting.  I had learned to do battle damage assessment from aerial reconnaissance photos a long time ago in the Army. And the blast damage, and ground effects from an explosive event, are pretty much the same,  no matter what the source of the explosion might be. It’s only a question of scale, and explosive force. Visually, there is very little difference in the appearance of a bomb crater, and an impact crater of the same size. So a forensic technique of reading the patterns of movement in the emplacement of blast effected materials on the ground applies well in the search for potential impact related geology. The quality of the image data now commonly available to anyone with a good PC, an internet connection, and a copy of Google Earth, is excellent.  In the past five years, the publically available image data has really come into its own. And today’s 21st century satellite imagery allows us to study the surface of the Earth at a level of detail our fathers could never have imagined.

Back in the 1920’s, using aerial photography, a geologist named J. Harlan Bretz noticed  evidence for the mega-floods that sculpted the Grande Coulee, and the ‘Channeled Scablands’ of eastern Washington. Bretz was the first to use Aerial photographs to detect,  and map, catastrophic mass movement of the Earth’s surface materials when he described the scarring of a catastrophic glacial flood event at the end of the last ice age, in an event he called The Spokane Flood.

Aerial photography allowed him a perspective from which patterns of fluid flow, and catastrophic mass movement of terrain materials, could be perceived on a scale that had been unimaginable until he described them. What he had found, were the patterns of fluid flow, like the ripples you see in the sedimentary deposits of a stream bed, but these ‘ripples’ are hundreds of feet high. Bretz saw them as empirical evidence of a major catastrophic flood event, on a scale that the standard theorists of his day thought was inconceivable.

Today we know that all of the water came from a glacial lake now referred to as Lake Missoula. The huge lake formed in western Montana during the ice age, when a lobe of the Cordilleran Ice Sheet extended far enough south that it blocked the Clark Fork River in Northern Idaho. More than 600 cubic miles of water was released when that ice dam failed. And the volume of the resulting flood torrent has been calculated at 8 to 10 cubic miles per hour. Or flow a rate that amounts to 10 times the combined flows of all the rivers on the planet Earth. It turned out J.Harlan Bretz was exactly right. Although most of the academic community of his time thought he had a screw loose, or two.

Almost a hundred years before him, most geologists had already decided to agree without question that sudden, catastrophic, geologic changes just didn’t happen anymore. And that all geomorphology on the surface of the Earth is the result of slow processes we see going on around us today, and requiring millions of years. They were naively mistaken. 

One of the biggest mysteries I’ve ever confronted lies in the question of how  theoretical geology could be so far removed from the empirical reality now clearly visible, and legible, in modern 21st century satellite images.

It didn’t take much digging in the history books to figure out where the Earth sciences went wrong.

The root problem with the thinking in the Earth sciences goes all the way back to Gottfried Leibniz, in the early 18th century, and his slogan of ‘Natura Non Facit Saltus’, (Nature does not jump). Leibniz may have been a mathematical genius. But he  wouldn’t even pass a 5th grade geology test of today. Yet he had the full backing of governments, big business, and the big churches. Because he believed, and taught, that the Great God of the Universe had created planet Earth, with all its flora, and fauna, just for us, and to do with as we pleased.

The old clichés like ‘buying a pig in poke’, ‘don’t let the cat out of the bag’, and ‘empty sack of lies’ all have their roots in the same old con. It went something like this: At an old country fair, a con artist would approach a likely looking mark to sell him a piglet in a ‘poke’ bag. But it’s not really a pig in the bag; it’s a cat. The cat wiggles, and squirms, just like a little pig when you poke him through the bag. And as long as the bag stays closed, the con works just fine. But as soon as the bag is opened, the cat escapes. And the victim is left holding nothing but an empty sack of lies.

Carl Linnaeus, and Charles Darwin, loved Leibniz. And they both quoted him verbatim. He managed to almost completely eliminate any academic consideration of episodic worldwide catastrophes from western thinking. And by the time James Hutton, and Charles Lyell, came along, most geologists were well-conditioned followers of his way of thinking. Hutten gets the credit for the origin of Uniformitarianism. Charles Lyell just popularized his ideas in 1830, when he published his book ‘Principles of Geology’. But Hutten, and Lyell, just picked up on Leibniz’s thinking, and ran with it.

They weren’t brilliant geological thinkers either. But their unquestioned uniformitarian/gradualist assumptions, based on the idea that the earth was shaped only by slow-moving forces still going on around us today, and expressed in the slogan of “The present is the key to understanding the past”, has become the foundation postulate of the Earth Sciences ever since. Governments, and big institutions, loved it. And they bought it like a pig in a poke with generous funding packages that came with rules that shut the door to any consideration, or publication, of theories of sudden catastrophic events, as a possible driving force in the geo-morphology of this world for more than 150 years. That’s a cruelly long time time to leave the poor kitty in a bag.

But the questions of just what the hell happened around 13,000 years ago that caused the extinctions of the mega fauna in North America, the disappearance of the Clovis culture, and a return to Ice age conditions that lasted more than a thousand years, has caused us to take a closer look, and I’m afraid we’ve let the cat out of the bag.

The trouble we face today, Just as Mr. Bretz did back in the 1920s, is that through the same 19th century process of mutual-inter-assumptive reasoning, and confabulation, instead of sound, experiment-driven, science, the Earth sciences are still founded on that unquestioned ‘Gradualist’ assumption. But gradualism only works until something sudden happens. And Harlan Bretz showed us that if you want to understand, or predict, the nature of the planetary scarring of a geologically recent catastrophic event, especially one that’s different from anything that’s ever been studied before, Sir Charles Lyell’s 19th century, gradualist-assumptive, reasoning just won’t get you there. 

Apparently, being able to see the truth is no guarantee that anyone’s going to bother to look where you’re pointing anytime soon. It wasn’t until 1965 that a report from an independent geologist’s tour concluded that Harlan Bretz was right. And finally, in 1976, at the age of 96, he was awarded the Penrose Medal of the Geological Society of America. Which is just about the most prestigious award a person can get in the field of geology. Upon receiving the award, Mr. Bretz  is said to have complained to his son that he couldn’t gloat properly, because all of his enemies were dead. 

The satellites of today have raised the ante. Using aerial photography from blimps, and airplanes, Bretz could see evidence of catastrophic material movement on a statewide scale. With the imagery now available through Google Earth, we can detect, and read, patterns of catastrophic mass movement of terrains on a continental scale. The event Bretz perceived was only implausible from a standard theory viewpoint because of its size. And yet, by comparison, and in the final analysis, someday it may be seen that his glacial mega flood in the Pacific Northwest was only a minor little footnote in the events of the early Holocene. And some of those events were far more terrible then a glacial flood.


TunguskaBlastIn June 1908, an explosion rocked a remote, swampy area in central Siberia, in Russia; it came to be known as the "Tunguska event." And a later expedition to the site found that 20 miles of trees had been knocked down and set afire by the blast. Today, it’s understood that Tunguska’s devastation was caused by a 100-foot asteroid that had entered Earth’s atmosphere, causing an airburst. 

mamoth

Some 13,000 years earlier, just after the end of the last ice age, the Earth’s climate had begun to warm up to temperatures much like what we enjoy today, when an occurrence thought by many researchers to be some kind extraterrestrial impact set off an “impact winter”, and a return to ice age conditions that lasted another 1,300 years, or so. And the event coincided with the end of the prehistoric Clovis culture. And the mass extinction of almost all of the giant animals that lived on North America at the time.

Perhaps the single most important paper on the subject of the Younger Dryas Cooling, is the 2007 paper by R.B. Firestone et al, and titled: Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling

The 2007 Firestone paper caused a pretty good stir in the academic community. And it has become the ‘Flagship’, so to speak, of the Younger Dryas impact hypothesis.

In it, a team of twenty six scientists, studying sedimentary deposits, presented a whole suite of compelling evidence for a massive impact event of a comet that appears to have broken up, and scattered, fragments all across North America. The multiple, air bursts are thought to have triggered wide-spread bio mass burning on a continental scale. As well as causing a return to ice age conditions, and the extinction of many species. Including the mega fauna, like mastodons, wooly mammoths, and giant sloths. In all, I think something like 35 genera went extinct.

Its exact cause is by no means, a settled science though. And the biggest weakness in the YD impact hypothesis, as written, is that it’s impossible to construct a model with a four mile wide bolide that has enough time in the atmosphere to break up completely, and scatter fragments, and devastation over a continent sized area, without making a good sized crater somewhere.  And “where’s the crater?” became a rallying cry of opponents to the hypothesis.

The debate continues to go around, and around. Firestone, and friends, had found compelling evidence in the stratigraphic record that implied some kind of very large impact related catastrophe had occurred to trigger the Younger Dryas Cooling, and the megafaunal extinctions. But it was clear that the event was vastly different from anything that had been studied before. So they could only speculate on just exactly what the nature of the event was, or what had hit us, or where the actual impact zones were. Without an astronomical model that could confidently describe the the nature of the impactor/s, they were were at an impasse.

Meanwhile, astronomers Victor Clube, and William Napier, in their book The Cosmic Serpent, had been talking about the giant comet they described as the progenitor of the Taurid Complex since 1982. Their data is as solid as anything you can dig up with a trowel. But except for them, and a few others like Bob Kobres, no one had connected the the dots, and put the Younger Dryas comet, and the Taurid Progenitor together. Except in private, speculative, emails, and letters. And to the best of my knowledge there was nothing in refereed literature.

Then, In early 2010, Professor Napier  published  a paper in the Journal Monthly Notices of the Royal Astronomical Society titled, Paleolithic extinctions and the Taurid Complex in it we read:

"The proposition that an exceptionally large comet has been undergoing disintegration in the inner planetary system goes back over 40 years (Whipple 1967), and the evidence for the hypothesis has accumulated to the point where it seems compelling. Radio and visual meteor data show that the zodiacal cloud is dominated by a broad stream of largely cometary material which incorporates an ancient, dispersed system of related meteor streams. Embedded within this system are significant numbers of large NEOs, including Comet Encke. Replenishment of the zodiacal cloud is sporadic, with the current cloud being substantially overmassive in relation to current sources. The system is most easily understood as due to the injection and continuing disintegration of a comet 50-100 km in diameter. The fragmentation of comets is now recognized as a major route of their disintegration, and this is consistent with the numerous sub-streams and co-moving observed in the Taurid complex. The probable epoch of injection of this large comet, ~20-30 kyr ago, comfortably straddles the 12.9 kyr date of the Younger Dryas Boundary.

   The hypothesis that terrestrial catastrophes may happen on timescales ~0.1 Myr, due to the Earth running through swarms of debris from disintegrating large comets, is likewise not new (Clube & Napier, 1984). However the accumulation of observations has allowed us to build an astronomical model, closely based on the contemporary environment, which can plausibly yield the postulated YDB catastrophe. The interception of ~1015 gm of material during the course of disintegration is shown here to have been a reasonably probable event, capable of yielding destruction on a continental scale.

   The object of this paper is not to claim that such an encounter took place at 12,900 BP – that is a matter for Earth scientists – but to show that a convincing astronomical scenario can be constructed which seems to give a satisfactory match to the major geophysical features of the Younger Dryas Boundary data.

If indeed the YDB event was an astronomical catastrophe, its occurrence bears little relation to current impact hazard assessments derived from NEO surveys."

With Professor Napier’s work specifically proposing in refereed literature that the Taurid Progenitor was the Younger Dryas comet, he changed the game completely. Because he didn’t just give us a convincing astronomical model of the event. We also have a pretty good picture of the physical properties of the thing that did the disastrous deed. And if you can describe a beast, you can predict it’s footprints.


Linear_composite2cFrom Comets, Catastrophes, and Earth’s History by W. M. Napier we read ,

“The evidence that an exceptionally large (50-100 km) comet entered a short-period, Earth- crossing orbit during the upper Paleolithic, and underwent a series of disintegrations, now seems compelling. The idea is not new, but it has been strengthened by an accumulation of evidence from radar studies of the interplanetary environment, from the LDEF experiment, from numerical simulations of the Taurid complex meteoroids and ‘asteroids’, and from the latter’s highly significant orbital clustering around Comet Encke.

RAS-comet2The disintegration of this massive Taurid Complex progenitor over some tens of thousands of years would yield meteoroid swarms which could easily lead to brief, catastrophic episodes of multiple bombardment by sub-kilometer bolides, and it is tempting to see the event at ∼ 12,900 BP as an instance of this. Whether it actually happened is a matter for Earth scientists, but from the astronomical point of view a meteoroid swarm is a much more probable event than a 4 km comet collision.

The images of Comet LINEAR , and Comet Scwassmann-Wachmann 3,  make it abundantly clear that Professor Napier is probably right. And that total, explosive, fragmentation of a comet can occur at any time. And it can happen before it even gets close to a planet. It doesn’t need the atmosphere to do that.

Both of those objects are typical daughters of the Taurid complex. So they are also typical of the kinds of objects we see in Earth crossing orbits. And while they themselves don’t represent an immediate threat, There is the potential for many more undiscovered Near Earth Objects out there just like them that do. With the Taurid Complex as the astronomical model for the YD impact hypothesis, we don’t need to account for how the YD comet broke up. Because we know it was probably already a cluster of smaller fragments before it got anywhere near this fair world of ours.

I asked NASA’s David Morison what he thought of the possibility of a cluster impact event. And he expressed his doubts. Saying that he thought it was ‘highly unlikely’. But the fragmented nature of the objects above would seem to say that the opposite is true  And the realization that most catastrophic impact events are probably the result of a large cluster, or stream, of smaller fragments, instead of a single, large, bolide as has been assumed in the past, represents a significant paradigm shift in NEO threat assessment, and impact science.

Impact research is an infant science. And thanks to poor funding for Near Earth  Object research, and for impact science in general, we don’t have a very good handle yet on the variety or quantity, of objects out there that might threaten our world, much less a comfortable understanding of the different kinds of devastation that might be released in a catastrophic impact besides what we see in a generic, single, solid-bolide, crater forming, kinetic impact event.

So who is to say what a full suite of impact markers should be? And what of airburst blast effects?

Tunguska of 1908 was the largest impact event in recorded history.  And yet the blast effected materials at ground zero do not qualify it as an impact structure. Indeed, if there hadn’t been any eye witnesses, our impact scientists would be in complete denial of an ET origin for all the violence there that day. There is no reason to think Tunguska was an isolated event. Or even a big one, on the grand scale of such things.  And, in a poster by Dr Boslough titled, The Nature of Airbursts and their Contribution to the Impact Threat. we read:

“Ongoing simulations of low-altitude airbursts from hypervelocity asteroid impacts have led to a re-evaluation of the impact hazard that accounts for the enhanced damage potential relative to the standard point-source approximations. Computational models demonstrate that the altitude of maximum energy deposition is not a good estimate of the equivalent height of a point explosion, because the center of mass of an exploding projectile maintains a significant fraction of its initial momentum and is transported downward in the form of a high-temperature jet of expanding gas. This “fireball” descends to a depth well beneath the burst altitude before its velocity becomes subsonic. The time scale of this descent is similar to the time scale of the explosion itself, so the jet simultaneously couples both its translational and its radial kinetic energy to the atmosphere. Because of this downward flow, larger blast waves and stronger thermal radiation pulses are experienced at the surface than would be predicted for a nuclear explosion of the same yield at the same burst height. For impacts with a kinetic energy below some threshold value, the hot jet of vaporized projectile loses its momentum before it can make contact with the Earth’s surface. The 1908 Tunguska explosion is the largest observed example of this first type of airburst. For impacts above the threshold, the fireball descends all the way to the ground, where it expands radially, driving supersonic winds and radiating thermal energy at temperatures that can melt silicate surface materials. The Libyan Desert Glass event, 29 million years ago, may be an example of this second, larger, and more destructive type of airburst. The kinetic energy threshold that demarcates these two airburst types depends on asteroid velocity, density, strength, and impact angle.”

At Sandia Labs, Dr Boslough used their ‘Red Storm’ supercomputer to simulate the  airburst, and impact, of a 120-meter diameter stony asteroid. And it represents an example of that second, geo-ablative kind of air burst.

The colors are graded by temperature. White = 5527 ºC, Red = 1727 ºC.

For comparison, an ordinary oxy-acetylene cutting torch in a steel shop uses a thin stream of hot gases at only about 900 ºC. and 40 PSI. to cut steel. The speed of that stream of hot gasses is only a little bit more than a stiff breeze. But that’s all it takes to ablate solid iron, and to blow it away, into runnels of melt, and heaps of slag.

Dr Boslough tells us that: “Simulations suggest strong coupling of thermal radiation to the ground, and efficient ablation of the resulting melt by the high-velocity shear flow.”

I think  his simple statement may represent the cusp of another major paradigm shift in the Earth sciences. Especially when you think it through. And when you consider what form the blast effected materials of a geo-ablative airburst like that should be expected to take.

During the event, any ablated materials would be in an atmospheric suspension, in a ‘fluidized’ flow. Similar to a pyroclastic flow. But wind-driven, like the froth, and foam, on a storm tossed beach, not gravity-attracted, like a pyroclastic flow down the flanks of a volcano. So we face a conundrum. Standard uniformitarian/gradualist geologic theory has always assumed without question that only terrestrial volcanism can produce pyroclastic rock.  And deposits of sheet ignimbrites have always been seen as conclusive evidence of explosive volcanism. Even when no volcanic vent, or magma chamber can be identified.

The word ‘ignimbrite’ comes from the Latin for ‘Fire Cloud Rock’.  So, since geo-ablative airburst melt would be formed and emplaced in a cloud of fire, it’s still a good word to describe airburst melt. Volcanic Tuff, and Airburst Melt, are both ‘Fire cloud rocks’.

An important thing to keep in mind is that, no matter whether a piece of ‘ignimbrite’ is truly volcanogenic, or if after detailed chemical tests, we can conclude an ET origin, either way, such materials are always the product of a violent explosive event. And as the blast effected materials of an explosive event, the patterns of movement, and flow, that get frozen into them during emplacement can reveal much of the true nature of the explosive event that put them there.    

I don’t want to digress into a discussion about volcanoes. But it’s important at this point to understand the internal structure of these kinds of materials, and how they move during formation, and emplacement. And why it might be easy to get them confused. It’s time to put on your fluid mechanics hat.


FLOW FLUIDIZATION

From How Volcanoes Work

The extraordinary velocity of a pyroclastic flow is partly attributed to its fluidization. A moving pyroclastic flow has properties more like those of a liquid than a mass of solid fragments. It’s mobility comes from the disappearance of inter-particle friction. A fluidized flow is best described as a dispersion of large fragments in a medium of fluidized fine fragments. A constant stream of hot, expanding gases keeps the smallest of the fragments (ash and lapilli size particles) in constant suspension. This solid-gas mixture can then support larger fragments that float in the matrix.

In Fluid Mechanics Such a flow is also known as a density current. So, a rock of geo-ablative airburst melt should be expected to be similar in structure to ‘ignimbrite’. And it might be visually indistinguishable from volcanic tuff.  The final test for ET origin would be to look at the isotopes. Horton Newsom at NMU tells me that we should expect to see significant siderophile, or platinum group element, enrichment as supportive evidence of ET origin. But there might be an easier way to identify geo-ablative airburst formations, simply by reading the patterns of flow that were frozen into them when they were formed, and emplaced. 

Because of the difference in motive forces involved, one wind-driven, the other gravity-attracted, there would be fundamental differences in the way geo-ablative melt, and it’s volcanogenic cousin moves, and flows, during formation, and emplacement. And in satellite images, in ‘orphan’ ignimbrite deposits, we’re looking for wind-driven patterns of movement, and flow. And by ‘orphan’, I mean to say that no volcanic system has been positively identified to account for them. And since the debris of the Taurid progenitor is thought to have hit sometime in the geologically recent past, we should expect those geo-ablative formations to be in very good condition, undisturbed, and on the surface. 

For more than 150 years, standard gradualist geology theory has assumed without question that only terrestrial volcanism can produce the explosive forces needed to make a pyroclastic density current of flash melted stone. And for generations they’ve used sheet ignimbrite deposits as conclusive evidence of explosive volcanism, in spite of often not being able to locate a vent, or magma chamber, it came from; not even with our best 21st century technology.  But Since geo-ablative airburst melt would be in the form of a wind-driven pyroclastic flow while it’s in motion, that’s exactly what structural form any geo-ablative material would take as it comes to rest, and cools. And except for its wind-driven patterns of flow which become frozen in at the moment of emplacement, it would be visually indistinguishable from ignimbrite, or volcanic tuff.


The Chihuahuan Ignimbrites of central Mexico are one such orphan deposit. There, and in the Sierra Madre Occidental mountains to the west, there are more than 350,000 cubic miles of random colliding, inter-flowing, sheet ignimbrites, undisturbed, on the surface, in pristine condition, with wind-driven patterns of flow. And less than 15% can be positively attributed to a volcano. The problem with studying them in the past, has been that they cover such a vast, and remote, desert area, that using antiquated surveying techniques of the past, it has been difficult, and time consuming. As a result, except for a 100 km stretch along the roadside between Chihuahua City, Mexico, and El Paso Texas, they are almost completely unmapped. And in refereed literature, all we find of their origin is speculation.

The theorists of the past had to come up with a plausible model of an explosive event powerful enough that it could get hundreds of thousands of cubic miles of rock up in the air into atmospheric suspension, in a pyroclastic density current, at the same time. And if ‘the present is the key to the past’, as they say, there is nothing in recorded history that gives us an example of how something like that could happen.  They could not imagine such energies coming down from above. So they invented  a theoretical kind of super-giant eruption called an Ignimbrite “Flare Up” event. 

It’s thought the event dates to the mid tertiary, when extensional forces in the middle of the continent are thought to have caused fault-grabens in the middle of the continent, hundreds of miles long, to suddenly open up, transforming into vast fissures that belched all those ignimbrites in an unimaginably violent explosive event, and then closed up again. But there are major problems with that theory.

First of all, after decades of geological surveys to catalogue Mexico’s mineral wealth, no seismic, tomographic, ground penetrating radar, or any other data, has ever revealed a single one of those fault-graben-turned-fissures. Much less a magma chamber big enough that almost all of central Mexico must be a supergiant caldera that makes the Yellowstone caldera look like a mouse breaking wind by comparison. And no one can explain the crazy mantel physics required for those giant, magic trap-door vents that are assumed to have opened, and closed, without a trace.

The old gradualist-assumptive model falls apart quickly when questioned closely. But whether volcanogenic, or exogenic, pyroclastic rock is always the signature of a violent explosive event. And if you want to understand an explosive event after the fact, you begin by studying the emplacement motions of the blast effected materials.

Doing so may have been difficult, and time consuming, on the ground. And with an old fashioned surveyor’s transit the task would’ve taken decades. But the satellite technology of the 21st century has made it possible to map the emplacement, and directionality, of those flows to an amazing level of detail. And from the comfort of one’s own desk.

Using Google Earth’s ‘save image’ feature, I made a very large, hi-resolution image map of overlapping saved images seamlessly stitched together with Photoshop. I then had the image map printed out professionally in a hi resolution format that covers a whole wall. A sheet of clear plastic for an overlay, some markers to draw little arrows to indicate the direction of flow wherever they were discernable,  and I had a high resolution flow map of the Chihuahuan Ignimbrites that would’ve taken decades of difficult surveying, in the middle of some of the most inhospitable terrains on Earth, to produce the old way.

The problem with the assumed ancient age is that they are all in perfectly pristine condition. And they are the undisturbed capstone of the terrains they’re blanketing. Whatever else they are, geologically old, they’re not. And after a few thousand hours of studying their patterns of  emplacement, I can tell you that those are are wind-driven patterns of motion frozen into those pristine pyroclastic rivers of flash melted stone.  The heat, and pressure to ablate the surface, and to produce and emplace, the Chihuahuan ignimbrites came from above. The ignimbrites themselves consist of materials from the original surface. But flash melted, and blown around a bit. Just like the froth, and foam, on a storm tossed beach. 

The age estimate of the terrains of central Mexico is based on assumed slow erosion rates of ordinary wind, and rain. The landforms in the region seem to be worn down to the nubbin. And no one could ever have imagined that ablation from above might be a factor. But an ablative airburst event can be expected to move more material in seconds than ordinary weather can in many millions of years.

If we are working from the standard postulate that the Chihuahuan ignimbrites were laid down before the landforms rising among them began eroding, then the ignimbrite sheets should be as heavily weathered, and eroded, as everything else. And they should be under the alluvium that erosion would’ve produced. But the millions of years worth of alluvium we should expect to see covering the Chihuahuan ignimbrites is missing from the satellite images.  And as anyone who looks closely can see, the ignimbrites themselves are almost perfectly pristine, and unweathered.

Good field work, and detailed chemical analysis of field specimens will have the final word. But a very compelling case can be made from satellite image data for the statement that the mountains, and landforms of central Mexico weren’t heavily eroded to their present state over millions of years. They were heavily ablated in a large, multiple airburst, impact storm. And over a period of just a few seconds. The vast, interflowing, ignimbrite sheets are the product of that ablation. And their almost completely unweathered condition, as the capstone of the terrains, disproves the assumption of ancient age. The ablative event must have been only a few thousand years ago.


The real test of any supercomputer simulation, or model, like Mark Boslough’s, is whether or not it is predictive of something we can find in real life on the ground, and in this case, we can. Take a good look at that simulation again. Remember, you are looking at a cross-section. Imagine it in 3D. Take a  close look at the bottom of the down blast vortex. And pay special attention to the patterns of flow at the point of contact with the ground.

In the image below, I’ve chosen an ordinary-typical example from the Chihuahuan “Ignimbrites” to give you an idea of what something like can do. And what I’ve been talking about. The mountain you see in the image below is at 29.702168, -105.686617 about 150 miles south, southeast of El Paso, Texas. And it is not unique. There are many others nearby. The terrain you see in this image is ordinary-typical of more than 50,000 square miles. Note the radial, outwards flowing curtain of melt. The wind-driven patterns of flow frozen into that curtain at the moment of its emplacement are a perfect match for the patterns of flow at the bottom of the large airburst vortex in Dr Boslough’s simulation. The white line in the bottom of the image is 5 miles long.

bp1

Click on the image to view a 3D PhotoSynth of this mountain

As you can see, the radial, outwards flowing curtain of pyroclastic rock is almost perfectly pristine.  There is no question but that the mountain is the source location of the materials in the curtain. But the mountain itself is a cuesta that consists of uplifted meta sedimentary strata. It’s not a volcanic vent, or rift, at all. 

These are the patterns of movement you see when a fluid is driven across a surface by high velocity atmospheric pressure. Like I said, just like the foam, and froth, on a storm tossed beach. Gravity wasn’t the motive force for the material movement we see evidence of here.

The indication of the speed of the materials in the emplacement of the curtain of melt is the outwards pointing chevrons clearly visible in the patterns of flow.

The shocker here, is that the mountain probably didn’t exist in any form at all at until the moment of the impact.  I suspect that it was uplifted as the surface rebounded upwards after the impact shockwave hit.  In other words, in a sense, it ‘bounced’ up after the impact of the shockwave like the surface of a trampoline. But we need to look closely at the ablative patterns of flow in its outer surface.

 

In the simulation, note the supersonic upwards flow in the center of post impact vortex. The mountain was born almost in an instant as the surface bounced back from pressure of the shockwave, and it rebounded up into the impact vortex.  So, at the same time the ablated material in the radial curtain was being ablated, and blown outwards, the rebounding surface at the center was ablated, and the materials that were removed, were drawn up into the impact plume by the upwards flow at the center of the vortex. At this point, it’s hard to say where they might have fallen back to Earth. 

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And the signature of that supersonic, and ablative,  upwards flow in the middle of the vortex  is in the deep V shaped excavations that wider at the top, and center of the flow. What has been interpreted as the work of millions of years of erosion is in fact, the work of just few seconds of an ablative airburst. And probably not so long ago at that.

Dr Boslough only simulated the airburst of a single fragment. But the blast effected materials in the giant impact zone this airburst structure is setting in the middle of, describe a cluster consisting of thousands of air bursting fragments that big. And if Comets Linear and SW-3 are any model of the density of the debris cluster, those larger fragments were probably accompanied by clouds of stuff down to the size of dust grains. And all of it falling into the atmosphere at something like 30 kilometers per second, like a giant shotgun blast.

There are well over 50,000 square miles of geo-ablative terrains like that in central Mexico alone. The zone extends up into west Texas. And the region is unique on the surface of the Earth. The Arid climate has preserved the blast effected materials in context, and in perfect condition. And except for the occasional sage brush, or cactus, most of it is in almost the same condition as it was the first year after the impact storm.

I don’t see anything in the satellite images that would allow one to pin down the exact age of these formations with any degree of confidence. But I struggle to understand how anything on the western half of the continent could’ve survived the fires.  The entire food chain over a vast area would’ve been compromised. Most of it burned away down to the last blade of grass. Since these formations are in such good condition, I like their emplacement event for a suspect in the early Holocene megafaunal extinctions.

A very compelling case can be made that a similar large cluster of comet fragments also hit the Laurentide ice sheet in a region from northern Minnesota to the Arctic ocean. And I have a hard time imagining what the climate consequences of destroying an ice mass as big as the continental US. And suddenly evaporating a couple of hundred thousand cubic miles of ice directly into the atmosphere. All the while burning the biomass away from the other half of the continent.

I’ll describe the blast effected materials of the Northeast impact zone a little later on. But for now, there is more to show you in the west, and southwest.


The other day I was watching an episode of the ‘Meteorite Men’. It was the one in which they went to try their luck at the Odessa crater, in Texas. It was a good show. But the guys had a tough time of it. Untold numbers of meteorite hunters, and collectors, have worked that site over the years. And they’ve turned the ground over so much looking for meteorite fragments, it’s barely recognizable as an impact structure anymore.

Geoff, and Steve, worked that site every which way but loose. And they still came up empty handed…, almost.

It wasn’t until they gave up looking, packed up their gear, and started driving away disappointed, that the Meteorite Men found anything. On their way out of the area, in the gravel of the road, they spotted meteorite fragments lying right there in plain sight. So they stopped, took out their metal detectors, and started digging fragments. After giving up on a day of frustration, they made a pretty good haul, right there in the gravel of the road. And they left the area with some really nice Odessa Irons.

And then, as happy as can be, they just drove away, richer by a few nice meteorite fragments, (As a matter of fact, a few thousand dollars worth!) and a good episode for their TV show. But in missing the significance of where they found those iron meteorite fragments, they also drove away from what may be the most single most important clue of their careers.

Here’s a Google  image of the Odessa Crater, and the Museum at 31.765137, -102.479064. As you can see, it’s been so dug up, and turned over by meteorite hunters over the years it’s barely recognizable as an impact structure anymore.

You see, when those dirt roads in that oil field were graded, they hauled in aggregate to elevate the road surface a few inches above grade for better drainage. That aggregate did not come from inside the crater. It came from a quarry location about 20 miles away. The mystery there was; since the dump truck that brought in that thin layer of aggregate got its load from a quarry miles away, and not the Odessa Crater, how did all those Odessa Irons get into that load of aggregate for the road bed?

The answer, is that that Odessa crater is not alone. It is only one of many thousands in a vast cluster event. Turn on Google Earth, and scan the area carefully from an eye height of about 5 km. Scattered among the oil fields there are too many craters like the Odessa structure to count.

I have heard that ‘most geologists agree’ that the Odessa event was about 60,000 years ago. I don’t believe that for a minute. I want to see proof. I’ve also heard estimates as young as 20,000 years. Until I see some radiometric data, I am working from the postulate that they are much younger than that. Less than 13,000 years old as a matter of fact. And they are all the same age. Give, or take a few seconds.

There are also thousands of fairly normal craters in New Mexico, and west Texas averaging about 100 meters wide that have never been seriously considered as potential impact structures. And for no other reason than there are too many of them, all the same apparent age. And it has always been assumed that a multiple fragment impact storm, or cluster impact event would be “Highly unlikely”. So, with the exception of the Odessa crater, all of its sister craters that we can clearly see in the satellite images of the Oil fields near Odessa,  and Midland Texas have been ignored.

This one is near Odessa, at 31.617601, -102.271674. It’s a little over a hundred meters wide. And it is typical of thousands.

This next one’s at 31.788219, -102.153964, and is 189 meters across.

And there are a few more Odessa craters in this Gallery

View Odessa Craters

View Full Album


There is another type impact structure I’ve been told is highly Unlikely. And that’s oval craters caused by oblique impacts. But in the early Holocene sediments of a dry lake bed in northern Nevada at 39.739717, -115.388916 we can find a place where a cluster of oblique impacts hit the submerged sediments of what would’ve been a shallow lake at the time.

Here’s the north end of the lake from an altitude of about 45 km.

Nevada  

Unlike the airburst formations in central Mexico, there are good visual cues here to establish an age, give, or take a few centuries.

I did a few crude impact experiments with a low powered rifle, and a mud puddle. Not exactly laboratory conditions. But good enough to determine that the weird, feather shaped ejecta plumes downrange to the northeast from the points of impact are consistent with a low angle impact of about 30 degrees into a submerged surface, and are probably the result of the ejecta’s interaction with the water of the lake. And to determine that the strangely distorted beach lines that correspond to that lake level are the result of some of the lake sediments being splashed out of it banks.

On the north end of the lake, and the cluster of oblique craters, we see where, as the lake returned to its banks after the impact event, the beach lines criss-crossed some of the ejecta plumes. Beach lines in a dry lake are like bathtub rings. And they give us an age. That set of beach lines represents the lake’s last, and lowest, shore line before it dried up completely. Which puts it sometime in the early Holocene, maybe less than ten thousand years ago. I don’t know if an impact scientist has been on the ground there yet, probably not. But I do know that a 600 gram, carbonaceous chondrite, meteorite fragment was found in a neighboring dry lake bed.  

But it gets better. The direction of those plumes points to about 24 degrees north by northeast.  If we go looking downrange from there, we can find another field of oblique craters with the same direction, and trajectory, in the early Holocene sediments of the Red Rock River Valley in southwest Montana.

RedRockRiver 

We also have good visual cues to date this fall. Look in the upper left of the image map above. The ejecta splash from the oval crater at 44.642265, -112.077185 was blown over the top of, and is blanketing, one of the ancient meanders of the river.

And at 44.644033, -112.076880, the ejecta that’s covering that late Pleistocene/Early Holocene meander  provides an excellent stratigraphic horizon for dating the event. The two crater fields were probably formed in the same fall of fragments.  

Remember Harlan Bretz’s catastrophic flood event in Eastern Washington?

The timing of the two oblique crater fields in Nevada, and Montana, and the fact that Lake Missoula was downrange from the Montana impacts implies that the last time that ice dam failed, the impact storm these two fields of oval craters describe may have been the trigger, was it?

 

The Northeast Impact Zone, and the destruction of the Laurentide Ice Sheet

The distribution of the blast effected materials found in the Younger Dryas Boundary layer imply that the Laurentide Ice Sheet took a major hit. Firestone and friends thought that the most likely target zone was in the Great Lakes region.

From Evidence for an extraterestrial impact 12,900 years ago that led to the megafaunal extinctions and the Younger Dryas cooling. by R.B. Firestone et al, 2007 we read:

“Toon et al. suggest that an impact capable of continent-wide damage requires energy of 10^7 megatons, equivalent to an impact by a 4-km-wide comet . Although an impactor that size typically leaves an obvious large crater, no such late Pleistocene crater has been identified. The lack of a crater may be due to prior fragmentation of a large impactor, thereby producing multiple airbursts or craters. Hypervelocity oblique impact experiments (Peter. H. Shultz , unpublished data) indicate that a low-impedance surface layer, such as an ice sheet, can markedly reduce modification of the underlying substrate if the layer is equal to the projectile’s diameter. These results suggest that if multiple 2-km objects struck the 2-km-thick Laurentide Ice Sheet at 30°, they may have left negligible traces after deglaciation. Thus, lasting evidence may have been limited to enigmatic depressions or disturbances in the Canadian Shield (e.g., under the Great Lakes or Hudson Bay), while producing marginal or no shock effects and dispersing fine debris composed of the impactor, ice-sheet detritus, and the underlying crust.”

Peter Shultz’s hypervelocity ice sheet impact experiments indicated that we can expect the ice to explode on impact like the reactive armor on a battle tank. So we don’t necessarily expect to find any shocked minerals. Because all of the kinetic energy gets translated to heat. In fact, we aren’t looking for any of the normal features we would expect to find in an impact structure. The ice sheet impacts didn’t produce a single crater. But the violence of those impact induced hydro-thermal explosions, and all that inconceivable heat in the presence of a lot of water most certainly left its mark.

We can use the predicted location in the Archaean bedrock of the Canadian Shield to our advantage for a positive identification of the impact sites. The region is some of the most stable continental crust on Earth. And the last time there was any volcanic activity in the Canadian Shield was more than two, and a half billion years ago. That’s really deep time! It’s more than half the age of the Earth. And it is almost too ancient to grasp. But during that time, super continents like Gondwanaland, and Pangaea, have come together, drifted apart, come together again, and drifted apart yet again to become the world we know today. Giant mountain ranges like the Himalayas have been raised up to dizzying heights, crumbled to dust, washed out to sea, and then raised up again too many times to count. Entire ecosystems, the dinosaurs, and countless other species have evolved, flourished successfully for eons, and gone with barely a fossil to remember them by. More than half the age of the Earth is an awfully long time. So any evidence whatsoever of a geologically recent surface melting event is a major red flag. And by ‘geologically recent’ I mean any age since melt that is measured in millions of years our less.

We don’t have to look very far to find our surface melt formations. Just northeast of Upper, and Lower Red Lakes, Minnesota we see clearly legible patterns of movement, and flow, in surface melted stone. And the flows are almost in perfect condition. It’s the lighter pink colored, almost white stone. And it’s the marks of titanic hydrothermal explosions in the ice sheet. The heat source was hot enough to burn all the way down through the ice and partially melt the surface of the stone below. And the story told in the rivers of flowing stone is as easy to read as following spilled paint back to the can.

The whole region is as level as a parking lot. Drainage is poor. And, for the most part, where you see green in these images you are looking at peat of varying depths. And here  the ice seems to have provided enough of a heat sink to quench, and preserve, some of the extra terrestrial material that brought all the heat. You see it in the black arrowhead splash of molten material blown off to the side, and framed so nicely by the lighter native rock.

Below is a false color radar image depicting elevation. It’s graded from darkest-lowest to lightest-highest elevation. The deference in elevation for the area of the black splash from lowest to highest is only a couple of feet. The region is as flat as a parking lot. But the ghostly image of the splash and it’s associated rivers of melted stone show up clearly as raised features in the terrain.

RadarMapForWeb

The area is sometimes referred to as "The Patterned Peat Lands of Northern Minnesota".  Drainage is poor. And peat bogs are everywhere. But contrary to some of the old literature. The Laurentide ice sheet didn’t form the patterns. And the peat didn’t either. It only conforms to them, and fills in the low spots with green color; the deeper the peat, the darker the green. So in these image maps the depth of color of the peat bogs in the area is a good proxy for the contours of the depressions. The darker the green, the deeper the depression. The rectangular grid pattern you see is formed by a grid of drainage ditches. The rectangles are 1 x 2 miles wide. So we also have a good scale in the images.

The rock composition for the general area of the black splash is labeled on the USGS’s geologic maps as:

"Para gneiss and schist-rich migmatite -grades into undivided meta sedimentary rocks."

Migmatite is a rock of both metamorphic, and igneous, origin that exhibits characteristics of both rock types. Migmatites form under extreme temperature conditions during metamorphism through the heating (but not quite melting) of rocks in the presence of a lot of water. And where partial melting occurs in pre-existing rocks. They aren’t crystallized from a totally molten material, and are not generally the result of solid-state reactions. Migmatites are composed of a new material crystallized from incipient melting, and an old material that resisted melting. Exactly the kind of rock we would expect in the burn scars of comet induced, hydrothermal explosions in the ice sheet.

And the meta sedimentary rocks are further described as:

‘Meta sedimentary rocks-undivided-greywacke, slate, local units of conglomerate, arentite, graphic slate, fine-grained felsic volcanogenic, and volcaniclastic rocks, lean oxide iron-formation and its metamorphic equivalent. Includes the Knife Lake Group and the Lake Vermilion Formation in northeastern Minnesota.’

So the full range of temperatures, and conditions we should expect of an impact in the ice sheet, from hydrothermal to pyroclastic, is represented by the rock of the blast burns in the area.

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The only examples we’ve had in recorded history of the emplacement of a pyroclastic density current is in an explosive, ‘Plinian’ eruption. So the standard model assumes volcanic activity as the source of all clastic rock. And just as in Mexico, some unrecoverable flaws in that assumption are revealed here.

First of all, the problem with the words "volcanogenic", and "volcaniclastic", is that there is no volcano there. We are looking at an area of the Canadian shield. The bedrock is Archaean. There hasn’t been any volcanic activity there in 2.5 billion years.  And without a volcanic system you can’t make a case for volcanism as the heat source for the pyroclasts, and metamorphic facies, unless you can show that the materials themselves are that old.

As we’ve noted before, a pyroclastic density current does not move slowly like lava. While in motion, the particles, and fragments, of super heated rock are in atmospheric suspension. And the material is in a cloud of fire that’s typically moving at hundreds of miles per hour. That’s where we get the word ‘ignimbrite’, which comes from the Latin for ‘Fire Cloud Rock’. The motive force for a standard model, volcanogenic, pyroclastic flow is provided by gravity as an ash column collapses, and the materials are pulled downslope away from a volcanic vent.

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So the most glaring discrepancy is the lack of any volcano whatsoever to account for these flows of pyroclastic rock; no vent, no magma chamber. The pristine flows of “volcaniclastic” rock could not have come out of the ground. The other problem with using the standard model here is the lack of slopes to flow down. All mass movement on the surface of the Earth requires a motive force to get things moving. On such flat, and level, ground, and with no gradient whatsoever, we cannot assume gravity as the motive force for these pyroclastic flows.

The heat, and pressure to melt, and move,those pyroclastic materials could only have come from above.

The lines of movement in the melted, flowing stone in the area are clear, and well preserved. Also, they, and the nature of the rocks in the area, are consistent with being the burn marks of tremendous hydrothermal explosions in the ice sheet. They are the grayish to pinkish, sometimes blurry looking areas with flowing lines of once fluid, and moving,’ stone in them. And the number, and spacing of the hydrothermal burns is exactly what we would expect from many pieces of a large, fragmented, comet exploding in the Ice sheet.

Note the the inclusions of black material in the flows of fine grained clastic rock like the inclusions of till in a flowing glacier of ice. It is the fine grained, high carbon, material defined on the list as slate, and graphic slate. But that stuff was flowing with the melt at the time it was emplaced. And that doesn’t jibe with the well observed explanation for the sedimentary formation of a normal slate deposit. Whatever the inclusions of  black, high carbon, material are made of, it isn’t slate.

 Min25

Most of the old literature on the region focuses a lot of attention in the peat depressions and their possible  formation. The area is also known as "The Patterned Peat Lands of Northern Minnesota". There is speculation that Multiple glaciations caused the patterns. Or Lake Agassiz, and related glacial mega floods may have had something to do with it.

But the profoundly simple fact is that ice sheets, and glacial lakes don’t make pyroclasts, or blast melt, or any other igneous rock form for that matter. They can only erode away some of the surface detail. And if you look closely you will see that there is no missing surface detail in those  flows. The solidified flows show show almost no exfoliation, or decomposition. There is no glacial scaring on them at all. And Except for some peat growing here and there in the cracks, and depressions, the melted flows of felsic “volcaniclastic” rock are almost as pristine as the day they first cooled. And yet we know there hasn’t been any volcanic activity there in more than half the age of the Earth.

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By its very nature, the fine grained felsic “volcaniclastic” and “volcanogenic” (‘fine grained’ indicates it cooled quickly) rock on the list was a  fluid, in rapid motion at the moment of its emplacement. And here, as in Mexico, those motions are as easy to read as flowing paint. The ice did play a major role here in the formation of these patterns. But not in the manor that has been assumed. The depressions are the footprints of obstacles the melt was flowing around, and through, when it was emplaced. Those obstacles are no longer there because they were icebergs that were the comet blasted remnants of a shattered Laurentide ice sheet.

To sum up, the surface rock of the blast burns in the northeast impact zone grades from migmatites, which were formed from ordinary sedimentary deposits that were heated almost to the melting point under terrific heat, and pressure. And in the presence of a lot of water. To "volcaniclastic", and "volcanogenic" rock which was probably the same stuff. But heated all the way to a fast flowing state, and fluffed up a bit with hot gasses.  So in the recipes, and conditions, needed for the formation of the rocks of each of the blast burns we see the signatures of the full range of conditions and temperatures from hydrothermal to "volcanogenic", we should expect in the planetary scaring of an ice sheet impact. Those hydrothermal burn scars can be found in large numbers all the way to the Arctic. And when viewed forensically as the blast effected materials of an explosive event, they describe the almost complete destruction of the Laurentide Ice Sheet is a mater of minutes.

All along the eastern seaboard we see the Carolina Bays

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They date to the Younger Dryas boundary layer. And currently, no terrestrial process has been identified to account for them. But if you draw a line through the long axis of any one of them, you will see that the line crosses one of the Hydrothermal burns in Minnesota, and Canada to the north. My own theory is that they were formed by secondary impacts. The impact induced hydrothermal explosions in the Laurentide Ice Sheet tossed impactites of ice that formed the bays. So the bolides that made all those oval craters simply evaporated.


Imagine along with me for a moment. What say we take a great big comet, say 50 to 100 km wide, out of the Oort Cloud, or the Kuiper belt, and inject it into the inner solar system. And we park it a short period, elliptical, Earth crossing orbit, and break it up into not so little pieces. Let’s give it enough time for tidal forces to break it up completely, and stretch it out a bit. Our average fragment Should be about the size of the Tunguska object. But they ranged  from more than a half mile wide, all the way down to clouds of dust.

As the Earth’s orbit brings it across orbital path of the giant, fragmented comet’s debris streams , the fragments begin to fall into the atmosphere from the south at a low angle. And more than 30 km/sec. The first fragments to hit will produce atmospheric temps well over 100,000 degrees C. And they’re just cheerleaders, twirling batons in front of a parade. The rest fall into already superheated atmosphere, and just crank up the heat, and pressure. In this way, almost 100% of the kinetic energy of the fragments gets translated to heat, and pressure in the atmosphere. And that heat, and pressure, hit’s the ground as an almost continuous, supersonic, stream of airbursts, hotter than the surface sun.

With just a few short minutes of that, I’ll bet we could sterilize the whole lush, African Savanna, and make it look just like central Mexico, and the American Southwest.  And in fact, according to the fossil record, every mega-faunal ecological niche we see in the African Savanna, and more, is represented in the fossils below the Younger Dryas Boundary layer. But not above it. All that astonishing biodiversity was burned, and blown away in seconds.

Sound Crazy? Not so fast. The 2007 Firestone paper cited Toon et al when they proposed temps as high as 107 o  C. There’s that exponential thing again. That’s 10 million degrees Celsius. But Professor Napier pointed out for me that even if a bolide hits the atmosphere at 30 kilometers per second, and all of it’s kinetic energy is translated to heat in the atmosphere, it is difficult to get more than 100,000C. But that’s ok. Because either way, even with the more conservative figure, we are still describing temperatures that are more than enough to vaporize any known substance on the surface of the Earth. And to blow it away like wax under a high pressure blowtorch.

A compelling, almost conclusive, case can be made for the argument that the Younger Dryas cooling, the mega faunal extinctions of the early Holocene, and the demise of the Clovis people were all caused by the same event. It was the multiple, thermal airburst impact storms caused by the fragments of the Taurid Progenitor soon after its complete breakup. And the thermal explosive catastrophe its debris streams brought, was more violent than anything ever imagined.

There are still a lot of different theories as to the trigger event for the Younger Dryas cooling. And the cause of the megafaunal extinctions. As for me, I am firmly in the camp that’s convinced it was an impact event. But I perceive a vastly different kind of impact event from anything that’s ever been described, or studied, before.  And if you’ll imagine along with me a little more, I’ll try to summarize, and describe, the event as I think it probably happened. 


Some time between 20,000, and 30,000 years ago a great comet 50 km to 100 km wide was thrown into the inner solar system. And it immediately began to break up. That disintegrating comet was the progenitor of the Taurid Complex. A family of objects in related, short period, Earth crossing orbits. And 12,900 years ago, just after the end of the last ice age, two large clusters of fragments from that monster, both with the fragment size, density, and distribution like we see in comets Linear, or SW-3. Had a celestial train wreck with this fair world of ours. The individual fragments of each cluster were so close, that in the heart of their respective impact zones, only the first fragments to fall, fell into cold atmosphere. The rest fell into the already superheated impact plumes of those that had gone before. And they just cranked up the heat And pressure.

Something like 1.1 billion tons of material fell in those two clusters. And the event lasted a little over an hour. The progression of the event was a result of the Earth’s movement along it’s orbital path, as it crossed through the orbital path of the giant comet’s debris stream. Not a product of the Earth’s rotation. So that, if it was a daytime event, the fragments would’ve been outbound from perihelion. And as the Earth Crossed the debris stream, the airburst storms would’ve began in the west, and progressed to the east.  In a night time event, the debris stream would be inbound towards their perihelion, and the opposite would be true. You get a better idea of the progression of the event if you consider how fast the Earth itself is traveling. 

Assuming that the Earth’s orbit is roughly circular, we can work out it’s orbital speed with some fairly simple algebra. Since the average distance from the Earth to the Sun is 149,597,890 km., the Earth travels a distance of 2*Pi*(149,597,890), or 949,951,264.43 km per year. But I can’t wrap my brain around that number when you write it that way. I need it broken down a little more. There are 365 days in a year, and 24 hours per day. So we get a velocity of 107,300 km/h, or if you prefer, 67,062 miles per hour. So what? How do we put that into a scale that makes some sense?

We need to put that number into some kind of subjective context to make sense of it. 

Consider this: Earth’s Diameter at the Equator is something like 7,926.28 miles, or 12,756.1 km. Which means we’re riding the Earth through space along her own orbital path at a little more than 8.41 times her own width every hour. So, as the Earth crossed the orbit of the Taurid progenitor’s still concentrated debris streams, she would have only been in the path of that stuff for about an hour. And the two large clusters of fragments would have fell within a few short minutes of each other.

The eastern end of the Laurentide Ice sheet got hit in an area from Northern Minnesota, and the Great Lakes to the Arctic Circle. When the down-blasts of thermal impact plasma hit the Laurentide Ice sheet, they caused titanic hydrothermal explosions (steam) that lofted huge icebergs hundreds of miles in all directions. In a matter of minutes, much of the eastern end of the LIS was obliterated. Much of which probably went into the atmosphere as steam. And a few short minutes later, those flying chunks of ice were the impactites that formed the thousands of oval depressions all over the eastern side of the continent called the “Carolina Bays”.

The ice sheet impacts evaporated millions of acre feet of ice directly into the atmosphere as steam. There was probably much more of the ice sheet that went up as steam, only to rain down in the days, and weeks, that followed than was melted to flow into the sea. As North America burned, the storms around the world raged. There were probably torrential rains everywhere in the northern hemisphere for weeks afterward. How long exactly? Who knows? We can only estimate. But for a good ball park figure to start from, the biblical 40 days, and 40 nights, sounds about right to me.

And the signs of massive flooding that have been attributed by generations of geologists to the bursting of ice damns holding back Glacial lake Agassiz are, in fact, the flood effects of the flash melting of major portions of the eastern end of the Laurentide ice sheet. And the outflows from the resulting floods would’ve been to the north into the Arctic ocean, and the North Atlantic. There would also have been armadas of icebergs after the event in both areas. And I expect that the glacial till in those bergs must have been deposited on the ocean floor below as they melted. So I’d expect to see some evidence of that armada of icebergs in ocean cores.

Sea levels rose as the blasted, and melted, ice sheet flowed in mega floods to the sea. And just as today, most of the larger populations would have been in low lying areas. The seas would’ve risen too fast or anyone, and anything, living in coastal areas anywhere in the world, to escape. Every coastline all over the world was effected. And everywhere it would have been much like a giant tsunami. But this time, the flood waters rose and never receded. 

Much of an ice sheet bigger than the Continental United States was destroyed. The whole world was shaken to the core. And, like taking weight from a floating barge, the sudden shift of the weight of so much ice caused a massive uplift of the middle of the continent. Coupled with the powerful detonations of so many exploding comet fragments , it caused earthquakes, and volcanic eruptions all over the world. And global seismic activity was the worst in many millions of years.

Out of tens of thousands of large, air-bursting, fragments there is not one single impact structure the northeast impact zone that bares any resemblance to what standard impact theory might expect. There are a few hundred normal craters averaging about 100 meters width, in the southwest, on the outskirts of the primary impact zone there. And that have been pretty much ignored by the academic community. But for the most part, all of the planetary scarring of the event has been mis-defined as ancient volcanogenic. And most of the ages of those blast effected materials have been over estimated by orders of magnitude.

The other much larger cluster of fragments hit in central Mexico, and the American southwest. And it produced the most devastating geo-ablative effects of the two.

The Mexican cluster was approximately 500 miles wide. As the first of the fragments hit, they detonated high in the atmosphere. But the explosions retained their downwards momentum. And they hit the ground as devastating supersonic down blasts hotter than the surface of the sun. And as I said, Only the very first fell into cold atmosphere. The rest of the fragments just piled on in, and added to the heat, and pressure. Mexico didn’t have an ice sheet to protect the surface by exploding on impact like reactive armor on a battle tank. And there, the overpressures from the blast waves were so powerful they blasted whole mountain ranges aside like clumps of flour on a bakers table.

As the comet’s debris continued to pile in, the heat, and overpressures, continued to build. In seconds all of central Mexico was pulverized into a surreal, and blasted, landscape of  heavily ablated, and melted terrains, like a Salvador Dali painting. It generated a post impact storm front, hundreds of miles wide,  and hundreds of miles from front to back. And it  rushed downrange to the northwest at supersonic speeds, sterilizing the western half of the continent on a swath from Mexico to the Arctic, along a storm front extending from California to the great plains.

The blast wind incinerated everything it passed over. In the hottest part of the impact zone, vast quantities of stone were vaporized, and whipped up, into the storm, where the atmosphere worked like a refining tower. And in a fiery rain, the materials precipitated out of the impact storm, down wind according to their condensation temperature, and specific gravity. This was like nothing ever imagined in our most frightening nightmares of disaster, or catastrophe. During the impacts, and for a few minutes after, most of North America from Mexico to the Arctic, and from California, to the plains of the Midwest, was engulfed in a firestorm like something we should only expect to find on the surface of the sun. And there is not one square inch of the surface terrains of western North America in its path that doesn’t bare the scars of that blast of heat.

In fact, look closely in modern satellite images. You’ll see that all of the high ridges of the mountain ranges of California, Colorado, Utah, Wyoming, and Montana that had glaciers at the time bare clear and obvious signs of the heat. And a profound feature that is easy to spot in satellite images is melted glacial ridges, blown over to the north, and northwest, like runnels of melted wax on the side of a candle. And we typically see high glacial valleys below those deformed, and melted, glacial ridges that have all of the material that was once suspended in the Glacier lying exactly below where it was in the glacier. Indicating that the glacial till dropped out so fast it’s as if the ice just vanished in a quick puff of steam.

While the mega floods from the blasted ice sheet were still flowing into the sea. Much of the biomass of western North America was burned away. And much of the resultant smoke, and soot, was blown high above the atmosphere where it blocked sunlight for years. There was an immediate sharp drop in temperatures world wide. And it was the worst kind of ’Perfect Storm’. Made all the worse because at the same time the destruction of the LIS caused a sudden rise in sea levels world wide. It it may have caused a shutdown of the thermal haline cycle which brings tropical warmth to the North Atlantic. Be that as it may, Northern Europe quickly cooled to arctic temperatures. And the cold remained for something like 1,300 years.

The Clovis people, and whole species, and ecosystems, were annihilated in seconds. Much of the western half of the continent was incinerated, and sterilized. The other half was devastated. The food chain of the entire northern hemisphere was severely compromised. And except. for rare, and random, patches here, and there, that remained somehow unscathed like the one surviving undamaged house in a neighborhood hit by a tornado. The lush savannah the giant animals of North America depended on for food was gone down to the last blade of grass. Those giant animals that survived in the southeast corner of the continent faced a drastically altered, and reduced food supply. And they simply starved. The specialist predators that depended on those animals for food perished as well. The species that survived extinction were the most adaptable, the smaller ones that didn’t eat much, and those that were just plain lucky.

If there were any human survivors of that day, anywhere in the western hemisphere, they were hiding in a deep cave somewhere well south, and east, of the impact zones. And they were cringing in terror as their world was erased and made new again. Any who peeked out of the cave without getting themselves killed, may have told stories of fire breathing dragons remaking the world with breath so hot it could melt mountains.

All that might sound like the product of an overactive imagination. But using modern satellite imagery, a very compelling case can be made that the scenario described above is very close to the exact truth.

One could make a good case that similar comet impact storms from the Taurid Complex caused the Bronze Age collapse 5,200 years ago.

The remaining debris of the Taurid Complex is still out there. And there are still fragments of significant size in Earth crossing orbits. It is almost a certainty that the next major impact event will be an airburst. And it is a certainty that we haven’t seen the last catastrophic impact event of the Taurid Complex.

Something wicked this way comes. It’s been here a few times before. It’s caused extinctions before. It’s even killed humans in large numbers before. And it can be implicated in the collapse of many bronze age civilizations. Next time it comes back, it would be good to see it coming in time to get people out of the way. And to prepare for human survival in a drastically altered globate climate. Yet congress would rather whiz away 70 million dollars trying to convince us a trace gas that’s important for life to flourish on this planet should be thought of as a pollutant. All the while giving funding for impact research, and the search for Near Earth Objects, little more than lip service. 

Published in: Uncategorized on April 28, 2011 at 6:11 am  Leave a Comment  
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A Geophysical Rosetta Stone

Remember the story of Cassandra’s Curse? In one version of the story, the God Apollo was so taken by her beauty that he fell in love with her. And as a token of his love, he gave her the gift of prophesy. Cassandra cheerfully accepted Apollo’s gilt. But she spurned his affections. At first, poor ole Apollo was as broken hearted as can be. And after he had a chance to stew on it for a while, he became just about as angry as a God can get. But after thinking it over a bit, Apollo decided he couldn’t take back his gift of love. Cassandra could keep her gift of prophesy. But he laid a curse on her. And her curse was that no one would ever believe her.

So the essence of Cassandra’s curse was that she would always see the truth clearly. But she couldn’t share it.

Now, in the 21st century, and at the dawn of the information age, new knowledge is in great abundance. There is much to distract. And the ability to see a new truth is no guarantee that anyone is going to even look where you’re pointing anytime soon. Especially if that new found empirical truth runs contrary to some foundation assumptions, and postulates, in the Earth sciences that have gone unquestioned since the early 19th century.

But suppose 21st century technology allowed you to discover an ancient text, written in a language no one had ever encountered before. And you were able to perceive the clues needed to decipher, and read it. What should you do if the form of that text is such that everything you read in it should be treated as empirical fact, and yet the story it tells disagrees with almost everything you have been taught to assume about the uniform, and gradual geohistory, and geomorphology, of the world we live on? Should you try to tell the startling, and catastrophic, truth revealed in that text by shouting it from the mountaintops? Or should you try to teach others to read it for themselves?

I can promise you that, if no one else can read the same truth for themselves, then no one will ever believe it. And it’s Cassandra’s curse all over again. So as for me, I’ll opt for the latter.

One of the best kept secrets in science today is just how good the satellite imagery available through Google Earth has gotten in the past decade of the American southwest, and central Mexico. And the biggest leaps in quality have happened in the past two years. Most of the region is imaged to better than 1 meter per pixel. And the imagery has gotten good enough to assign a directional vector to almost every pixel of the vast sheets of ignimbrite flows. And to read the directions of the fluid emplacement motions like reading a dance chart.

Using Google Earth’s ‘save image’ feature, I made a very large, hi-resolution image map of a large area in the Chihuahuan desert, and it’s vast rivers of melt, consisting of 50 overlapping screen shots seamlessly stitched together with Photoshop. I then had the image map printed out professionally in a format that covers a whole wall. A sheet of clear plastic for an overlay, some markers to draw little arrows to indicate the direction of flow wherever they were discernable, and I had a very high resolution flow map, that would’ve taken decades of difficult surveying, in the middle of some of the most inhospitable terrains on Earth, to produce the old way. A very high resolution flow map like that allows one a forensic perspective of the fluid motions of the emplacement event of those ignimbrites that’s never been available before.

It has always been assumed that only terrestrial volcanism can produce pyroclastic rock.  So the realization that a very large airburst like a larger version of the Tunguska blast of 1908, should be expected to be capable of melting, and ablating, the surface represents a significant paradigm shift in the Earth sciences. Because it describes an entirely new, non-volcanic way to produce Ignimbrite, or ‘Fire Cloud Rock’ It also means that we need to be able to tell them apart.

Fortunately, due to the fact that they have completely different motive forces during emplacement, it turns out that’s not much of a problem.

I don’t want to digress into a discussion about volcanoes. But it’s important at this point to understand the internal structure of these kinds of materials, and how they move during formation, and emplacement. And why it might be easy to get them confused. It’s time to put on your fluid mechanics hat.


FLOW FLUIDIZATION

From How Volcanoes Work

The extraordinary velocity of a pyroclastic flow is partly attributed to its fluidization. A moving pyroclastic flow has properties more like those of a liquid than a mass of solid fragments. It’s mobility comes from the disappearance of inter-particle friction. A fluidized flow is best described as a dispersion of large fragments in a medium of fluidized fine fragments. A constant stream of hot, expanding gases keeps the smallest of the fragments (ash and lapilli size particles) in constant suspension. This solid-gas mixture can then support larger fragments that float in the matrix.


While in motion, a volcanic pyroclastic flow relies on the pull of gravity for its motive force. The resulting lines of flow will always be downslope, and away from the volcanic vent they came from.

But geo-ablative melt is wind-driven from behind. And since the lines of flow in an unconstrained, and driven, fluid will always be away from the driving force, then when those lines of flow are frozen into a river of melted stone, they become a permanent, reliable, record of the nature of the forces that melted, and moved it.

Thanks to their different motive forces, the two kinds of flows are as visually distinct in satellite imagery as apples, and oranges.

On that fluid motion map, we can assign a directional vector to every pixel at better than 1 meter per pixel resolution with ease. We can read the directionality of the flows, and perceive how it flowed as a fluid with starling clarity. And when we recognize that they are wind driven flows, then they become a proxy for the explosive atmospheric conditions ablating them from the surface, and driving them like the froth, and foam, on a storm tossed beach.

And if each directional vector on our map is thought of as one character of text in a written language of rocks in fluid motion, then our map becomes a sort of ‘Rosetta Stone’ for learning a new geophysical language. One in which the empirically true, and catastrophic, geological history of the western hemisphere is recorded in exhaustive, and intricate, detail.

Published in: Uncategorized on April 14, 2011 at 4:26 pm  Comments (2)  

An Overview

Bob Kobres has been talking about the danger posed by  comet impacts since the early ‘80s. He’s got a better handle on the issue than most. And I’m of the opinion that just about everything he’s got to say about the subject should be required reading.

The following  overview is mirrored from Bob’s web site. And the original can be viewed at: http://abob.libs.uga.edu/bobk/overview.html 

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A problem with conveying subject matter related to past encounters with Near-Earth-Objects (NEOs) is the novelty of this area of research. There is presently considerable divergence of opinion and not a small amount of mis-or-misleading information. This is especially true when discussion focuses on the recent past–say the last 12,000 years. In particular, contemporary findings DO NOT support the ideas of Immanuel Velikovsky. On the other hand, it is not correct to assert that there is no evidence of significant, recent, extraterrestrial influence. To aid readers who are new to this area of inquiry I offer this brief overview:

First, it is important to realize that the recent knowledge of numerous large NEOs has forced a shift of paradigm. The idea that conditions on Earth change only slowly (Gradualism) has been accepted and taught since the mid eighteen hundreds and only began to lose dominance in the late nineteen-sixties with the recognition of truly catastrophic floods. This quiescent view of the world was in part held necessary for biological evolution, which was also supposed to occur only through gradual change. Obviously this approved view of the world did not encourage investigation of evidence which suggested abrupt change–the tendency was to rationalize contrary observation into accord with the gradualist paradigm. What this means is that there are, in fact, no true experts in this realm–only a growing number of avid, qualified in their particular field, researchers.

Next, interaction with extraterrestrial material should be viewed as a continuous process with both long and short term components–similar to volcanism but harboring potential for greater affect on an existing order. In other words there is a continuum from dust input due to disintegration of NEOs–particularly comet type bodies–to discreet impacts with objects that are kilometers across. There is currently a tendency for the press as well as new to this field researchers to fixate on the latter due to the more dramatic aspects of large impact events. This focus can be misleading with regard to contemporary risk assessment.

Penultimately, the reader needs to be aware that there is considerable evidence for the recent (less than 30,000 years ago) arrival of a large (greater than 100 km in diameter) comet type NEO. These clues range from direct observation of a growing number of NEOs with above chance similarities of orbital parameters to stories of celestial events that have been passed down or archeologically recovered. One problem here is that folklore, symbolic artifacts, downturns of climate, the collapse of a civilization, and so on, have been studied with no appreciation of the potential for extraterrestrial influence. Whether one views this with dread or zest, there is need to reevaluate much potentially pertinent material.

Finally, there is reason to see this threat to the biosphere as an incredible opportunity to improve conditions on Earth. This can be accomplished by exploiting resource rich NEOs using energy directly from the Sun as the environmentally injurious processes of extracting the same elements from Earth are phased out.

~Bob Kobres

Published in: Uncategorized on February 15, 2011 at 7:53 am  Comments (4)  
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Oval Craters in 3D

I’ve already talked about these oblique craters in Oblique Impacts in Nevada. I want to talk about them a little more. And share a few stereo views of them.

To see the images in 3D, simply focus on the center line, and cross your eyes a little until you see a 3d image in the middle.

The largest of these three is about a mile from end to end.

NV7R

The lake had water in it up to the level of the lowest set of beach lines at the time of impact. This accounts for the strange shape of the ejecta splashes downrange from the impact points.

NV8R

To the best of my knowledge no formal field work to collect specimens for C14 dating has ever been done here. And I don’t think an impact scientist has been on the ground there yet either. But, among the meteorite hunting community, the dry lakes of northern Nevada already have a strong reputation as a happy hunting ground. From what we can see here, it’s no wonder.

And we may not have any tested dates yet. But we can still come up with a pretty good educated guess that puts us in the ball park. That set of beach lines we see lying across an ejecta splash can be dated with high degree of confidence to the early Holocene, or right around the end of the last ice age. 

NV9R

These Nevada meteorites fell into a shallow lake. But downrange, to the northeast, in Southwest Montana, we come to another set of oval craters. There, we see where many pieces of something fell into the soft sedimentary deposits of the Red Rock River valley. And with exactly the same trajectory.

MNR

Again we have a location that can give us a good indication of the age of the event. It’s where one of the ejecta curtains fell across an ancient meander of the river. That meander is about the same age as the beach lines lying across the ones in Nevada.

MN1R

The odds of two different, low angle, impact events, happening at different times, in locations so close together, yet having exactly the same trajectory are inconceivable. So it’s a good bet the two crater fields are related, that the craters are all part of the same fall, and are some of the remaining scars of a major, multiple fragment impact event.

Here’s where my curiosity get’s set on fire. Those features are all about the same age as the Grand Coulee, and the ‘Channeled Scablands’ of eastern Washington.

If we look further downrange to the northeast, we come to the huge basin of Glacial Lake Missoula. During the Pleistocene, it’s waters were being held back by a glacial ice dam on the Clark Fork River in northern Idaho. That ice dam had been stable for tens of thousands of years when it suddenly, an inexplicably, broke up, and released a catastrophic mega flood downstream that gouged out the Channeled Scablands of eastern Washington in a matter of days.

That flood happened right around the same time those pieces of something plowed into the wet sediments on the bottom of that shallow lake in Nevada, and when the ejecta splash from an oval crater fell across a meander of the Red Rock River, in southwest Montana.

The ages are about right. Did the same regional impact storm that left all those oblique impact craters cause the breakup of the ice dam on the Clark Fork River at the end of the last ice age? Was this the trigger event for Harlan Bretz’s flood?

Published in: Uncategorized on December 23, 2010 at 2:28 pm  Leave a Comment  
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Footprints of Dragons?

If you were given a book with pictures of the footprints of all of the different animals in a zoo, would you be able to walk around that zoo, and match images of footprints with the beast that made them?

I’ve been told many times that a cluster impact event would be ‘highly unlikely’.

But consider this. For the most part, there are two families of orbits, from which objects that impact the Earth might come from; the asteroid belt, and the Taurid Complex. There is some pretty scary stuff in the asteroid belt that would be extremely dangerous if it were in an elliptical, Earth-crossing, orbit. But, for the most part, they are in stable orbits. And they are no threat.

Most of the dangerous objects in Earth-crossing orbits come from the Taurid Complex, not the asteroid belt. And when we look at that family of objects, we don’t find solid asteroids. We tend to find highly unstable comets that tend to break up, and fragment into thousands of pieces. And, in fact, swarms of cometary fragments, and debris, from the Taurid complex are the most common type of object in Earth-crossing orbit. This means that airburst storms caused by cluster impact events of smaller fragments are, in fact, the most likely scenario for a catastrophic impact event, not a single, large bolide. And the fragment distribution of something like comets Linear, or SW-3, are a perfect match for countless small craters averaging 100 meter diameter we see in New Mexico, and West Texas.

Last month, I talked about the Footprints of a Fragmented Comet. Let’s look at some more of them in the same general area.

From 12 km above the dark depressions we see in the image below look like fly specks. And they begin to get really interesting when we zoom in, and look a little closer.

NewMexCluster I don’t know about you. But I see the footprints of a monster. And before it fell to Earth, that monster would’ve looked something like the fragments of comet Linear.Linear_composite2c 

They fill up with water in the rainy season. So the bottoms are silted in. And the features are slightly eroded. But when we zoom in for a close look at a couple of those ‘flyspecks’, we can clearly see the raised rims, and ejecta curtains of impact craters. And they are apparently all the same age.

NewMexCluster4 The two craters above are 150 meters diameter, and 80 meters Diameter.

NewMexCluster5They appear to be as much a product of airburst phenomena, as kinetic impact. And Few of them are exactly round. But the 75 meter crater at 32.36044, –103.396500 is close to perfect.

NewMexCluster6 In that group, they tend to be found in chains. This view is from about 4 km altitude.

I’m thinking the structure is related to airburst phenomena. And I am of the opinion that the particle sizes included material all the way down to the size of sand, or dust grains.

I would not expect to see the normal set of impact markers in these cluster of small craters. But I do expect to see enough extra terrestrial chemistry there to prove these are impact craters. And that they all fell in the same impact storm. It gets especially startling when you realize they are found in clusters like these, in varying concentrations, in  a large region than extends all the way to central Texas, and on down into Mexico

Since the morphology is not what we’ve expected to see in an impact structure, the proof of ET origin for these formations will be in the mix of isotopes.

Published in: Uncategorized on December 18, 2010 at 10:52 am  Comments (5)  
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