Ammonite introduction: Ammonoidea (scientific name: Ammonoidea) is a general name for a group of extinct marine organisms that lived from the Middle Ordovician to the Late Cretaceous. It is named after its surface usually has chrysanthemum-like lines. name. Ammonite fossils are excellent as standard fossils that geologists can use to date the formations containing them. Ammonoids first appeared on the earth from the late Silurian to the early Devonian, and finally became extinct along with the dinosaurs in the late Cretaceous.
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