8.65" Polished Jurassic Ammonite (Kranosphinctes) - Madagascar

Polished Jurassic Ammonite (Kranosphinctes) - Madagascar #290773

This is a 8.65" wide ammonite (Kranosphinctes sp.) fossil collected from near Sakaraha in the Tulear Province of Madagascar. It is Jurassic (Oxfordian Stage) in age or approximately 160 million years old. It has a well defined ribbing and is quite heavy. The exterior has been lightly polished.

It comes with an acrylic-metal display stand.

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.

More about ammonites