This Specimen has been sold.
3.1" Jurassic Ammonite (Perisphinctes) Fossil - Madagascar
This is a 3.1" wide, Late Jurassic ammonite (Perisphinctes) fossil collected near the town of Sakaraha in the Tulear Province of Madagascar. It comes with an acrylic display stand.
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.