This is a beautiful, 6.05" wide, polished ammonite (Cleoniceras) fossil from Madagagascar. It displays a distinctive, "oak-leaf" suture pattern on the surface. These ammonites are collected near Ambatolafia in the Mahajanga Province of Madagascar.
Comes with a stand.
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.
Artists reconstruction of an ammonite. By Nobu Tamura