Hoploscaphites Ammonite Association - South Dakota

This is a beautiful ammonite association from the Fox Hills Formation of South Dakota featuring Hoploscaphites nicoletti & Hoploscaphites (Jeletzkytes) nebrascensis ammonites. They've been nicely prepared from the hard concretion in which they were found and the base is flat enough that it will display nicely without the use of a stand. There are a few "friends" still stuck in the concretion that add another nice dimension to this beautiful association.

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.

Hoploscaphites nicoletti & Hoploscaphites (Jeletzkytes) nebrascensis
Dewey County, South Dakota
Fox Hills Formation
Larger ammonite 3.2"
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