An ammonite fossil. Ammonites are extinct molluscs of the class Cephalopoda which lived from the Devonian period approximately 400 million years ago to the end of the Cretaceous 64 million years ago. Editorial Stock Photo - Afloimages
An ammonite fossil. Ammonites are extinct molluscs of the class Cephalopoda which lived from the Devonian period (approximately 400 million years ago) to the end of the Cretaceous (64 million years ago).