The layered cliffs of Pointe de l'Eyssina consist of a regular alternation of hard sandstone (light) and marly clay (dark). This geological formation is called "flysch".
The flysch comes from deep marine deposits on an abyssal plain bordered by slopes with unstable mud.
- The soft layers, rich in clays show a regular sedimentation resulting from mud deposits even at great distances from the mouths of the rivers that carried them.
- The hard layers are turbidites: Deposits due to debris avalanches sliding abruptly from a slope and spreading over large areas of the seabed.
This phenomenon occurred regularly, explaining the alternating visible light and dark layers in the landscape.
The age of this formation is estimated at 70/80 million years (Upper Cretaceous).
The Eyssina Ridge: flyschs of the Parpaillon thrust sheet.
Within the layers, we can see helminthoids (traces of activity of living beings)