1.1" Jurassic Fossil Ammonite (Leioceras) - Dorset, England
This is a 1.1" wide ammonite fossil of the species Leioceras opalinum. The ammonite is Middle Jurassic in age and comes from the Middle Jurassic (Bajocian Stage) deposits of Dorset, England.
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.