The rocks of Aiguille and Ubrieux

The spur of the Aiguille is made up of late Jurassiclimestone Despite the compactness of this rock, the cycles of freezing and thawing have overcome some parts of the cliff: Large blocks of rock strewn over the wall in the south face. The land at the base of the cliffs is composed of softer sedimentary rocks, alternating limestone and marl-limestone beds. These marls are particularly well observed when passing through the Bourges ravine.