
A Calan is a hard limestone escarpment formed between 160 and 90 million years BC. These cliffs are the remains of an ocean presence in distress. Indeed, the Tethys ocean was here during the Jurassic period, the same period that saw the water level decrease. It was then that massifs such as the Alpilles ridges or as the calans were formed. Here, you can distinguish the Gros and Petit Calan because of their size.