6.6" Jurassic Ammonite (Hildoceras) Fossil - England

This is a large, 6.6" wide Hildoceras sp. ammonite from Whitby, England. It was found within a large concretion which was broken open to reveal the fossil. The majority of the surrounding rock has been removed, with one half of the nodule remaining for presentation purposes. This specimen comes with an acrylic display stand.

Ammonites were predatory mollusks that resembled a squid with a shell. These cephalopods had eyes, tentacles, and spiral shells. They are more closely related to a living octopus, though the shells resemble that of a nautilus. True ammonites appeared in the fossil record about 240 million years ago. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

Hildoceras sp.
Port Mulgrave, Whitby, North Yorkshire, England
Upper Lias, Bifrons Zone
6.6" wide ammonite, entire specimen 7.5 x 6.3"
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