1.4" Fossil Ammonite (Scaphites) - South Dakota

This is a 1.4" ammonite (Scaphites) from the Fox Hills Formation of South Dakota. Scaphites is a genus of irregularly coiled ammonites.This specimen ha some of its outer shell remaining while the inner shell is visible in some areas. The inner shell shows the intricate patterns of the sutures. This specimen is from an old collection and has a painted label.

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.

Scaphites hippocrepis
Belle Fouche, South Dakota
Pierre Shale
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