"Skipper" used this Mars Express HRSC image http://esamultimedia.esa.int/images/...leCrater_H.jpg (1.2 MB). Don't try to look for it on "Mars anomaly research" - I got a virus from that site this morning.

It's not suprisingly that there are compression artifacts in that image. It is a composite e of three colour channels and the nadir panchromatic image, compressed to be internet friendly, and then draped over a DEM and rotated to an oblique view. They are easy to see if you fiddle with the contrats in any image editor.

"Skipper" not picking this up must come under the title of willful ignorance.

Jon