Sure does look like a collapse. Not surprising, as lots of so-called
rills may to be much longer collapse structures, judging from the
occasional occurrence of roofed-over sections. Of note in this case is
that the floor of the pit in the most-magnified picture shows the same
digital geometric artifacts that we were discussing at length here
some months back when they were seen in some Google Earth views of
Mexico.
--Mixon
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A fearless man cannot be brave.
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