This Specimen has been sold.
4.3" Jurassic Ammonite (Hildoceras) Fossil - England
This is a large, 4.3" wide Hildoceras ammonite from Whitby, England. It was found within a large concretion which was broken open to reveal the fossil. The bottom edge of the concretion has been cut flat, allowing for the specimen to stand up nicely on a flat surface.
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.