Fossil Ammonite (Hoploscaphites) Cluster - South Dakota

This is an ammonite (Hoploscaphities) cluster from the Fox Hills Formation of South Dakota. It's been wonderfully prepared in the hard concretion it was found in. It contains three central ammonites, the largest being 2.2". The total height of this cluster is 3.1" In addition to the three central ammonites, there are a number of tiny ones and fragments still partially concealed in the stone. The ammonites are iridescent and stand out nicely against the dark stone.

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
Hoploscaphities nebrascensis
LOCATION
South Dakota
FORMATION
Fox Hills Formation
SIZE
2.2" largest ammonite, 3.1" tall
ITEM
#115068
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