1.97" Cretaceous Hoploscaphites Ammonite Fossil - South Dakota

This is a nice, 1.97" Hoploscaphities ammonite specimen collected from the Pierre Shale of South Dakota. The ammonite is in great condition considering the difficulty of removing it from the rock it was found in.

It comes with an acrylic display stand.

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.

What an ammonite would have looked like while alive.
What an ammonite would have looked like while alive.

These 70 million year old ammonites lived when South Dakota was a shallow inland sea. It was found preserved in a concretion that was split open. It then had to be hand prepared to remove the hard rock surrounding it from the shell, a very time consuming task.
Hoploscaphities nodosus
Meade County, South Dakota
Pierre Shale - Baculites compressus/B. cuneatus Zone
Ammonite: 1.97" wide
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