1.75" Hoploscaphites Ammonite - Pierre Shale, Montana

This is a bumpy, 1.75" Hoploscaphities crassus ammonite specimen collected from the Pierre Shale of Montana.

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 crassus
LOCATION
Garfield County, Montana
FORMATION
Pierre Shale
SIZE
Ammonite 1.75" Wide
ITEM
#110578
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