9.2" Wide Ammonite Fossil With Stand - Madagascar

This is a heavy, 9.2" wide ammonite fossil collected near Sakaraha in the Tulear Province of Madagascar. It is Jurassic (Oxfordian Stage) in age or approximately 160 million years old. There is not a lot of good identification material available for the species at this location, but the genus is likely Perisphinctes or something very similar. The entire specimen weighs about 9lbs and has no polishing work or repair done to it.

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.
Perisphinctes sp.
Near Sakaraha, Tulear Province, Madagascar
9.2" wide, up to 3.5" thick, 9 lbs
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