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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 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.