2.3" Callovian Ammonite (Paracildia) Fossil - France
This is a fossil ammonite of the genus Paracildia sp., collected from a location near Poitiers, France. It is Callovian (Jurassic period) in age, or approximately 165 million years old.
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.