Jurassic ammonites in a bedding plane. Ammonites were marine invertebrate molluscs that formed a spiral chambered shell, with the ammonite living in t
Jurassic ammonites in a bedding plane. Ammonites were marine invertebrate molluscs that formed a spiral chambered shell, with the ammonite living in the newest and largest chamber. Shells ranged in width from under 1 centimetre to over 1 metre. Ammonites first appear in the fossil record around 400 million years ago and became extinct at the end of the Cretaceous period 65 million years ago. The Jurassic period lasted from 201 million years ago to 145 million years ago.
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Photo credit: © SINCLAIR STAMMERS/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: -, ammonite, ammonites, animal, bedding, biological, biology, evolution, evolutionary, extinct, fauna, fossil, fossilised, fossilized, fossils, historical, history, invertebrate, jurassic, mollusc, natural, nature, palaeobiology, palaeontology, palaeozoology, paleontology, plane, prehistoric, prehistory, rock, strata, zone, zoological, zoology
