Two Cretaceous Hoploscaphites Ammonite Fossils - Montana

This is a pair of Hoploscaphities nodosus ammonite fossils collected from the Pierre Shale of Montana. The ammonites are in great condition considering the difficulty of removing them from the rock they're found in. The smallest ammonite has been mounted to the rock.

It comes with an acrylic 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