Ammonites
Ammonites are among the best-known fossils of prehistoric seas. They were extinct cephalopods, related to modern-day cuttlefish, octopuses and nautiluses. They first appeared hundreds of millions of years ago and spread through seas almost all over the world during the Mesozoic Era. Their shells had a characteristic spiral shape and were divided into individual chambers, which today create the distinctive patterns visible in many fossil specimens.
Ammonites survived several major climate changes and mass extinction events, but they finally became extinct at the end of the Cretaceous approximately 66 million years ago, during the same event that marked the end of the non-avian dinosaurs.
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