NEAL GRUNDY / SCIENCE PHOTO LIBRARY NEAL GRUNDY / SCIENCE PHOTO LIBRARY
Ammonite fossil. An ammonite is an extinct mollusc of the class Cephalopoda that lived from the Devonian period (approximately 400 million years ago) to the end of the Cretaceous period (65 million years ago). The ammonite's closest living relative is thought to be the nautilus.
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