VAUGHAN FLEMING / SCIENCE PHOTO LIBRARY VAUGHAN FLEMING / SCIENCE PHOTO LIBRARY
Fossilized ammonite. During fossilisation, the minerals of the ammonite's shell have been replaced by pyrite (iron sulphide), a yellowish metallic compound also known as fool's gold. Ammonites are extinct molluscs of the class Cephalopoda which lived from the Devonian period (approximately 400 million years ago) to the end of the Cretaceous (64 million years ago).
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