Description
Ammonites are an extinct group of cephalopods related to octopuses, cuttlefish, and nautiluses, which appeared 400 million years ago, during the Devonian period, and went extinct 65 million years ago, during the Cretaceous period, at the same time as the dinosaurs.
Members of this group had coiled shells of various sizes, made of aragonite, the mineral that also forms pearls. Their shells were divided into several internal chambers. They regulated buoyancy using gas in the shell chambers and propelled themselves by expelling water. Along with fish, they were prey for aquatic reptiles such as plesiosaurs and mosasaurs. Depending on the species, ammonites ranged from a few millimetres to 1.4 metres in diameter.
Ammonites are found fossilized in many locations around the globe, with those from Madagascar being particularly famous.





























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