NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Fossil belemnites. Belemnites were cephalopods, the group of animals that includes squid. They appeared during the Carboniferous Period (around 350 million years ago), and went extinct towards the end of the Cretaceous Period (65 million years ago). This dense accumulation is known as a belemnite battlefield. This is a 22-centimetre-wide slab of Jurassic shale from Yorkshire, UK. The Jurassic lasted from around 200 to 145 million years ago.
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