1.4" Iridescent, Fossil Ammonite (Scaphites) - South Dakota

This is a 1.4" ammonite (Scaphites) from the Fox Hills Formation of South Dakota. The iridescence of the outer shell creates a colorful display. This specimen has been well prepared and remains attached to the rock in which it was found.

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 sp.
LOCATION
North Central, South Dakota
FORMATION
Fox Hills Formation
SIZE
1.4" ammonite, 2.9 x 2.1" rock
ITEM
#129523
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