Re: Problem with this image from MRO?

On Mon, 28 May 2007 15:44:56 -0600, Milton Aupperle <spam@xxxxxxxxxxx>
wrote:

My guess is your looking at a breached lava tube (which would be
roughly elliptical in profile) or perhaps the top of a collapsed cavern
(? magma chamber ?) and there may not be any vertical walls visible.

I can think of several examples of this that I have seen personally in
my travels as a mining geologist. A good one is the "Craters of the
Moon" park in Idaho which had some really great breached and collapsed
lava tubes. I remember one you could walk through (about 15 meters wide
/ 10 meters tall diameter) that had a hole in the top and you could
look up at and see the sky.

Yeah, I've seen those kind of structures at Craters of the Moon, too.
This would have to be a good deal bigger than anything I've heard about
on Earth, but of course, with the lower gravity on Mars such structures
could be larger.

_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
.