Ammonite fossils. The large ammonites are Asteroceras sp., the small ammonites are Promicroceras sp.. Ammonites were marine invertebrates. They first appeared in the fossil record around 400 million years ago in the late Silurian and early Devonian periods and became extinct at the end of the Cretaceous period, 65 million years ago. Specimen from Lower Lias, near Yeovil, Somerset,UK.
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