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Ammonite fossil. Coloured scanning electron micrograph (SEM) of the fossilised shell of an ammonite. 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 around 65 million years ago at the end of the Cretaceous period. Magnification: x47 when printed 10 centimetres wide.
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