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 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
Scaphites hippocrepis
LOCATION
Belle Fouche, South Dakota
FORMATION
Pierre Shale
SIZE
1.4"
ITEM
#117208
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