Rocher de Sel

Rocher de Sel was formed when the Earth's crust folded upwards, pushing a previously buried layer of salt and clay upwards in a bulge. Later precipitation would erode the surface into its current scarred and furrowed state. It is unknown why the formation has not eroded completely, despite the susceptibility of its materials. It has been suggested that the clay repels the area's light rainfall before it can do much damage, or that the water becomes so saturated by salt that it quickly becomes unable to dissolve any more. Another theory states that the formation is still bulging upwards at a rate that almost matches the erosion.