This Specimen has been sold.
11" Jurassic Ammonite Fossil With Stand - Sakaraha, Madagascar
This is a heavy, 11" wide ammonite fossil collected near Sakaraha in the Tulear Province of Madagascar. It is Jurassic (Oxfordian Stage) in age in age. There is not a lot of good identification material available for the species at this location, but the genus is likely Kranosphinctites or something very similar. The entire specimen weighs about 16 1/2lbs and has been lightly polished with some minor repair work.
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. True ammonites appeared in the fossil record about 240 million years ago. The last lineages disappeared 65 million years ago at the end of the Cretaceous.