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A Ring Structure

The explosive process that did this has never been studied before.
 
The semi circular ring of Manuel Benivides is 17 miles wide. Jjust accros the border from Terlingua, Texas, and Big Bend National Park, USA. The perfect semi-circle was the first anomalous land form I noticed in the satelite images. It was obvious that it is the result of a violent explosive event that standard theory can't properly describe. And my obsessive curiosity wouldn't let me leave it alone.
 
The maps show this area to be volcanic due to the melt formations. But there is no volcanic vent here so the 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 ignimbrites 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. 
 
 
 Here we begin to see some of the clear evidence of the predominant southeast to morthwest 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 pressure driven, blast effected, materials were thrown into the super-sonic impact wind so they piled up outside the compression wave of the explosion in a standing wave of mega breccias 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 The breccias are heaped 800 to 1000 ft high.
 
 
 
 

 

 
 
 
 
 
 
 
 
 
 
 
On the opposite side, outside of the northwest edge of the  structure are repeated blankets of ejecta, and ignimgrites thrown down wind 10 miles, or more. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The melted material did not come out of the ground. There is no vent here. Whatever the heat source may have been it was not volcanic. The melt blankets of ejecta, consist of the original surface terrain, flash melted from above, and quickly blown off, and away, from its points of origin.  
 
 
 
 The white line in the bottom left is 1 mile for scale.
 
 
 
 
 
 
 
 
 
 
 
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 eys a little, untill 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-brecias on the up-wind side of the structure.
 
 
 
 
 
 
 
 
 
 
 
 Volcanoes don't do this.
 
 
 
 
 
 
 
 
 
 
 
 And for a little more 3D:  http://dl.getdropbox.com/u/2268163/Ben3D.pdf