Huge, 10.5" Polished Ammonite Pair - Agatized

Huge, Polished Ammonite Pair - Agatized #56158

Here is a huge, cut and polished Cleoniceras ammonite fossil quarried near Mahajanga Province, Madagascar. It's Early Cretaceous (Albian Stage) in age, or approximately 110 million years old.

It exhibits beautiful mineralization within the chambers, each separated by white calcite scepta (divisions). Some of the chambers are preserved as crystal lined pockets. The reverse side has a very beautiful, mother of pearl look to it. This highly polished, exotic ammonite makes a superb display piece with tremendous historical appeal.

Ammonites were predatory cephalopod mollusks that resembled squids with spiral shells. They are more closely related to living octopuses, though their shells resemble that of nautilus species. True ammonites appeared in the fossil record about 240 million years ago during the Triassic Period. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

What an ammonite would have looked like while alive.

More about ammonites