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Polished Madagascar Ammonite 2.37 Inches
Here's a polished Cretaceous ammonite of the species of the genus Cleoniceras from Mahajanga Province Madagascar. For something so beautiful it's hard to imagine it was a living creature inhabiting the shallow seas nearly 110 million years ago at the time of the dinosaurs. This is a beautiful fossil both from the aesthetic and the historical perspective.
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. Ammonites appeared in the fossil record about 240 million years ago and they barely survived several major extinction events. The last lineages disappeared 65 million years ago at the end of the Cretaceous.