3.8" Jurassic Ammonite (Macrocephalites) Fossil - France
This is a very beautiful, 3.8" wide Macrocephalites sp. ammonite from a location nears Tours, France. This Jurassic aged ammonite has been mostly prepped free from the rock that it was found in, however a large section of rock has been left attached and cut flat for presentation purposes. There are small unidentified fossil bivalves and ammonites scattered throughout the rock.
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.