Height 13" Width 1.5" Length 13.5" Weight 13 lbs.

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The ammonoids were shelled forms, many predacious in habit. Ammonoid shells, which are either straight or coiled, served as protective and supportive structures as well as hydrostatic devices, enabling the animal to compensate for varying water depths.

Ammonoids characterized by a more highly folded suture, called ceratite, replaced the goniatites and were most abundant in the Triassic Period (245 to 208 million years ago). Most ammonoid genera became extinct at the end of that period, but a few survived and evolved into many diverse forms during the Cretaceous Period (144 to 66.4 million years ago).

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