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 cephalopod mollusks that resembled squids with spiral shells. They are more closely related to living octopuses, though their shells resemble that of nautilus species. True ammonites appeared in the fossil record about 240 million years ago during the Triassic Period. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

What an ammonite would have looked like while alive.
What an ammonite would have looked like while alive.
Perisphinctes sp.
Near Sakaraha, Tulear Province, Madagascar
9.2" wide, up to 3.5" thick, 9 lbs
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