On 1/15/2017 10:00 AM, Bill Mixon via Texascavers wrote:
That valley El Picharo is certainly a curious feature. I wonder if it is an old caldera. Whole region looks virtually uninhabited, which might (or might not) make it a place for people up to no good to hang out. Surroundings seems to have well-developed surface drainage. -- Mixon
I wonder if it could be an old meteor crater? Lee
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