8.6" Fossil Ammonite, Bivalve, and Belemnite Association - England
This is a very displayable, 8.6" wide ammonite, belemnite, gastropod, and bivalve fossil association, collected from Jurassic-age (Bajocian stage) Inferior Oolite of Dorset, England. The rock is covered in fossil specimens which include two bivalves, three belemnite rostrums, a small gastropod, and eight ammonites, with the largest ammonite (Otoites sauzei?) measuring 3.2" wide. The base of the rock has been cut flat so that it displays nicely without the need for a 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.