The semi circular ring of The Benavides Impact Structure is 17 miles wide. Just across the border from Terlingua, Texas, and Big Bend National Park, USA.
The maps show this area to be volcanic due to the melt formations. But don’t you believe it. There is no volcanic vent here. This violence did not come from below. The 17 mile ring, as well as the smaller, overlapping, 8 mile wide impressions are all perfect circles incised into the surface from above. The mega-breccias and airburst melt outside the structure were blown there by a great force of heat and pressure which scoured everything from inside the circles and cut into the surface like a giant cookie cutter. And the heat inside the circles was enough to re-weld the fractures in the rock.
We see the sequence of these explosions in the layering of the ejecta that was blown to the northwest. The arrowhead shaped splash on northwest side, came first as a result of the 17 mile wide larger explosion. The mountains of mega-breccias on the southeast side of the ring was formed at the same time as the arrowhead splash of melt. The ring itself was incised into the ground when the downward momentum of the exploding fragment was coupled with the detonation shock wave of the blast, concentrating the force of the blast at the edge of the detonation shock wave.
The shorter of the two ejecta blankets on the northwest side of the structure are the ejecta of the smaller 8 mile wide blast that followed 2 or 3 seconds after the larger blast.
Here we begin to see some of the clear evidence of the predominant southeast to northwest direction of the impact firestorm in the directional nature of the breccias, and other blast effected materials of this structure.
Outside of the southeast edge of the structure, the ejecta was thrown into the super-sonic impact wind coming from the southeast so they piled up outside the compression wave of the explosion in a mountain of mega breccias.
The breccias are heaped 800 to 1000 ft high.
The pristine condition of the materials is startling. On the opposite side, outside of the northwest edge of the structure are repeated blankets of ejecta, and airburst melt were thrown down wind 10 miles, or more.
The emplacement motions of this ejecta blanket are perfectly clear, and legible.
The melted material did not come out of the ground. There is no vent, magma chamber, or any volcanic system whatsoever. The blankets of melt, and ejecta, consist of the original surface terrain, flash melted from above, and quickly blown away, from its points of origin.
As for the age? That remains to be determined. But, as you can see for yourself, since the moment of their emplacement, these splashes of ejecta, and impact melt, have not undergone any significant weathering at all. What ever else they are, those pristine ejecta curtains are not old at all.
These are stereoscopic images. Click on them for an enlarged view. To see the 3D effect simply focus on the center line, and cross your eyes a little, until a 3D image seems to appear in the middle.
Looking down to the southeast from about 45 km up.
The inter-fingering patterns of movement, and flow in the edges of these blankets of melt are consistent with sudden emplacement like impact melt ejected from a crater.
Looking west, down the valley formed by the ring, we see the mega-breccias on the up-wind side of the structure.
If you want conclusive evidence of an extra terrestrial origin for this violence look no further. Only impact events make mega-breccias.
And only giant impact events make mountains of them.