>Could this entrance have been triggered by a meteor falling over a lava
>tube?
>
>http://hirise.lpl.arizona.edu/ESP_023531_1840
>
>and click on this one in your browser for maximum detail:
>
>http://hirise.lpl.arizona.edu/images/2011/details/cut/ESP_023531_1840.jpg
>
>Lee Skinner
Maybe, but the absence of obvious raised crater rim and ejecta
suggest that the "crater" is just the angle-of-repose slope where a thick
overlying bed of loose sand has poured into the underlying bedrock hole.
The ring around the upper part of the slope might hint that a wider area
of rock has started to sag below (or perhaps the ring is just a single
more-cemented layer). The stereo view that the page promises for later
should be informative.
--Donald
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