
The Dent du Ratier mountain overlooks the Arvieux valley to the east and the gorges of the Guil to the south. This distinctive "stump" is a klippe: a piece of rock stuck on different rocks. Indeed, the lower and wooded area consists of shiny schists of Piedmont. As for the upper part, it consists of rocks from Briançon composed of a majority of marble for sign engraving. The stump itself is from limestone placed on a thin layer of schist. These last layers most likely older than the others are the remains of old eroded layers.