Mass mortality plate of ammonites. Ammonites were marine invertebrate molluscs that formed a spiral chambered shell, with the ammonite living in the newest and largest chamber. Shells ranged in width from under 1 centimetre to over 1 metre. Ammonites 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. Photographed at the international gems, minerals and fossils show held at Sainte-Marie-aux-Mines in north-eastern France. | |
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Credit: | Science Photo Library / Stammers, Sinclair |
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