William Elliot wrote in message ...
On Wed, 10 Mar 2004, Buck Galaxy wrote:

About four kilometers to the SE, in the Columbia Hills, is what looks
like it could be a gigantic cave. Check out this huge image:

http://www.msss.com/mars_images/moc/...1301467.25.gif

Be sure to click to maximize the image. It could be shadow but I
don't think so. It looks like it might have been an impact into the
side of the hill. This looks like a very good end mission goal.
Although a solar powered rover might not feel too welcome in a cave.

Thanks for these references. However as this 4.5 meg .gif file is beyond
my meager resources, is there a .jpg version or a much smaller .gif?

Being a caver, I tend to recognize "cavish" features and this is not
an obvious one. I have seen far better candidates on Mars where flows
obviously end in "sinks". I'd like to see some analysis of rock type
in such features.

I take my kids caving and tell them of the adventures they might have
in exploring lava tubes on the moon or the caves of Mars.