Unusual structures of Mourres

The Rochers des Mourres look like mushrooms with a friable clayey-limestone base and a hard and even limestone cap. These structures were formed by the stabilisation and the encrusting of calcareous sediments through aquatic grass and green algae on lakefronts, 25 million years ago. They have been growing vertically, following the fluctuations of the water level. The shaping of these sculptures so beautiful of Mourres are due to erosion.