- Jul 20, 2001
The first pic is sand dunes on a deflation surface (wind carved depressions).It would be nice to know what we're looking at.
The second pic has small dune fields. The depressions and fracture patterns look like permafrost expansion/contraction patterns. At least that's the main terrestrial analog I can think of that could produce similar patterns. Salt dome erosion might produce something similar but postulating the existence of salt domes on Mars would be problematic.