GAVIN KINGCOME / SCIENCE PHOTO LIBRARY GAVIN KINGCOME / SCIENCE PHOTO LIBRARY
Ammonite. Polished sectioned ammonite fossil. Ammonites are extinct marine invertebrates. They first appeared in the Late Silurian to Early Devonian period (around 400 million years ago) and became extinct at the end of the Cretaceous period (65 million years ago).
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