Details & Abstract
All that stuff is many million years old, a time where the sahara was an ocean. Our guide found several great looking shark-teeth, I guess I was too fascinated for taking photos of them. The photos below show shells, snails, shells, ammonite, petrified wood, sea urchin, shell, shell. Everything just lying on the ground.
Black to white
What's there? A layer of white sand, covered by a layer of brown sand, covered partially with black minerals.
What happens? A car driving above such ground sinks the black minerals down into the sand, and blows away the brown sand at the same thime -- therefore converting black into white.
The shapes that erosion by sandy wind form are no less impressive than the stuff that water shapes in caves.