Here, in the Miocene period, some twenty million years ago, the sea formed a shallow gulf. On the sandy bottoms lived many bivalves (species of clams, shellfish). Among them were Pectinidae. The species living today (Chlamys or Pecten) are known as scallops. These animals are not immobile and can move by forcefully opening/closing the two valves of their shells. The presence of whole shells here is evidence of the low level of agitation in the environment at the time.