2.7" Fossil Ammonite (Hoploscaphites) - South Dakota

This is a 2.7" ammonite (Placenticeras) from the Fox Hills Formation of South Dakota. It has been wonderfully prepared on the hard concretion it was found in. The ammonite is iridescent and stands out nicely against the dark rock. In addition to the ammonite, shell fragments of other ammonites and gastropods are visible imbedded in the rock.

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 nicolletti
LOCATION
South Dakota
FORMATION
Fox Hills Formation
SIZE
2.7", 4.4" total height
ITEM
#115152
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