re: Martian Razorbacks
Hey MG. Neat idea.
I'd bet those "razorbacks", which if you look closely occur along the edges of fractured blocks, have a geochemical origin. That is to say the material along the edge of the block is harder because of an alteration or deposition that occured along the fracture wall. Being harder, it's then more resistant to aeolian erosion.
Don't get me wrong, Mars is definately the home of some very non-earthlike geology, not to mention electrostatic sedimentary and chemical effects, but I think this one is more mundane than that. Keep looking! :)
"Beware of too much cleverness...." -Siddhartha by H.Hesse