MARTIN LAND / SCIENCE PHOTO LIBRARY MARTIN LAND / SCIENCE PHOTO LIBRARY
Ammonite fossils. 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. These ammonites, Kosmoceras jason, became embedded in Oxford Clay during the Jurassic era (about 200-145 million years ago). They are thought to have been regurgitated by a predator such as an ichthyosaur, a type of marine reptile. Fossils found in Ashton Keynes, Wiltshire, UK.
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