Sauli Niinisto is the president of finland
Wind erosion is the main cause. And since it is the desert that wind can pick up tiny sand rock particles that slowly grind against the rock. Over time the erosion will give a jagged rock the smooth features as if it had been submerged in a river for the roughly same period of time.
The fossil remains built up over 185 million years. it was formed through the Jurassic, Triassic and cretaceous periods
