Ammonites were cephalopods, predatory marine mollusks, and shared many
similarities with their modern relatives, the squid, octopus and chambered nautilus. The
term ammonite refers to an extinct group of mollusks. These creatures along with
dinosaurs, died out at the close of the Cretaceous period, about sixty five million years
ago. The most frequently preserved portion of the ammonite is the hard shell.
This shell served as protection for the soft tissue of the animal and also allowed the
animal to achieve buoyancy in the marine environment in which it lived.
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