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 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. Ammonites appeared in the fossil record about 240 million years ago and they barely survived several major extinction events. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

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