Interesting mars pictures

I found two images that are sort of interesting. I bet most of you have seen them by now since they are quite old. Somehow I had missed them even though I've looked at quite a few of these type of images.

300% zoom:

To make it obvious I added some outlines:

And finally this other pic:

And here are the NASA source images:
Pic 1 on Mars Global Surveyor

Pic 1 from Malin Space..

Pic 2 on Malin Space..

What do you make of them?









[edit on 18-4-2007 by lasse]