2.2" Jurassic Fossil Ammonite (Grammoceras) - United Kingdom
This is a 2.2" wide ammonite (Grammoceras thouarense) collected from North Yorkshire in the United Kingdom. The ammonite has been prepared mostly freed from the rock it was recovered from. One face is very well preserved, while the other is partly-worn and chipped. Comes with an acrylic 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.