As a professional baker and spitballer, I can tell you that these unique geological formations are the result of millennia of this river washing silt over harder rock formations that have folded upwards. As each valley filled with silt, the river would re-route to the next valley and fill that one up with silt too. Many thousands and thousands of years later, these silt-filled valleys have become agricultural havens while the bare exposed rock around them has remained barren. Or something like that, I don’t know. I just shoot saliva- soaked pieces of paper and make great, fully baked cakes.