Yeah, it's wild how there's just a 5cm thick layer of salt down under the sand, and mining salt slabs from the ancient sea is how most nomadic groups flavor their food.

Plus all the rock art and ancient cities just out in the middle of nowhere today. I once bought a dinosaur tooth from a guy that 1) agreed with claims I had heard that the mountains in the Sahara still harbor things like peach trees, and 2) that there are badlands style areas where herders just find dinosaur bones lying around.