This Specimen has been sold.
Large 6.9 Inch Cleoniceras Ammonite (Half)
Here is a very large half of a cut and polished ammonite from Madagascar. It's 6.9 inches wide and displays well on the included acrylic display stand. These ammonites are mined in the Mahajanga Province of Madagascar and are approximately 110 million years old There is a repaired crack through the center of the ammonite, but it doesn't detract from the beauty of the specimen.
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.