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 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.
What an ammonite would have looked like while alive.
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DETAILS
SPECIES
Hoploscaphites nicoletti & Hoploscaphites (Jeletzkytes) nebrascensis
LOCATION
Dewey County, South Dakota
FORMATION
Fox Hills Formation
SIZE
Larger ammonite 3.2"
ITEM
#98736
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