Pair Of Ammonite (Perisphinctes) Fossils - Jurassic

This is a pair of ammonite (Perisphinctes sp.) fossils in a natural association collected near Sakaraha in the Tulear Province of Madagascar. They are Jurassic (Oxfordian Stage) in age or approximately 160 million years old.

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
Larger ammonite 3.9" wide
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