Fossil ammonite

Fossil ammonite

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This image is part of the feature Fossils: Life On Earth

Credit: VAUGHAN FLEMING/SCIENCE PHOTO LIBRARY

Caption: A fossilized ammonite which has been sectioned and polished to reveal its internal structure. During fossilisation, the minerals of the ammonite's shell have been replaced by pyrite (iron sulphide), a yellowish metallic compound also known as fool's gold. The cavities within the shell are filled with calcite (calcium carbonate), which appears a golden yellow due to the presence of iron impurities. 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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Keywords: ammonite, animal, animals, calcite, fossil invertebrate, fossils, in fossil, invertebrates, iron pyrites, palaeontology, paleontology, pyrite, with fossil

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