2.5" Fossil Ammonite (Parussuria) On Rock- Idaho

This is a 2.5" ammonite (Parussuria) from the Thaynes Formation of Idaho. It is in good condition with some of the rock in which it was found, remaining to form a stand.

This ammonite comes out of an old fossil collection we recently purchased with a lot of unique material from unusual and often no longer accessible sites.

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. True ammonites appeared in the fossil record about 240 million years ago. 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.
Parussuria compressa
Bear Lake, Idaho
Thaynes Formation
2.5" ammonite, 3.0 x 1.0" on rock
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