[Texascavers] Martian pits

[Mixon Bill]

Interesting photos, blown up and enhanced. It looks like there's a  
relatively thin, hard layer of rock, presumably lava, over a deep  
mass of looser material that has been sapped out from below somehow.  
Doesn't look like a window into a lava tube, because the deeper stuff  
doesn't look like solid material. Hard to judge depth (even if I knew  
the scale), because it isn't really obvious that the bottom is seen.  
-- Mixon

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