MARTIN LAND / SCIENCE PHOTO LIBRARY MARTIN LAND / SCIENCE PHOTO LIBRARY
Fossilised ammonite (Asteroceras obtusum). Ammonites are an extinct group of molluscs that are thought to be related to modern cephalopods such as octopus, squid and cuttlefish. They emerged during the early Devonian era (about 400 million years ago) and became extinct 65 million years ago at the end of the Cretaceous period. This Asteroceras obtusum fossil dates back to the Jurassic period (about 200-145 million years ago) and was found in Lyme Regis in Dorset, UK.
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