Ammonites (Pleuroceras solare) in the sea, illustration. Ammonites were marine invertebrate molluscs with a spiral shell. Most were less than 20 centimetres across. They first appear in the fossil record around 400 million years ago and became extinct at the end of the Cretaceous Period 65 million years ago. | |
Lizenzart: | Lizenzfrei |
Credit: | Science Photo Library / Garlick, Mark |
Modell-Rechte: | nicht erforderlich |
Restrictions: | - |