8.7" Polished, Agatized Ammonite (Cleoniceras) - Madagascar
This is a beautiful, 8.7" wide, polished ammonite fossil from the Mahajanga Province of Madagascar. It's Early Cretaceous (Albian Stage) in age, or approximately 110 million years old and of the genus Cleoniceras. The fossil itself was replaced by agate and has been polished to reveal the beautiful, "oak leaf" shaped suture pattern of the animal.
Ammonitesare an extinct group of marine invertebrate animals which died out at the end of the Cretaceous period. These mollusks are more closely related to living coleoids (i.e. octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species.