Large, 9.3" Polished Ammonite Pair - Agatized
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 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.