ARP2 thanks for asking. Photoshop is of no use here. Better get yourself IAS Viewer and start examining the HiRISE jpg2000 images available. They're of better image quality, forget about the crappy jpgs
Also, Humanoid how did you get so close??? I'd LOVE to be able to to that too! I have Adobe Photoshop but I cant get that close and have it that clear.....
Ive looked at the full image and its hard so say what it could be. But if you look at similar photos of earth taken from space buildings has that formation.