2" Fossil Ammonite (Scaphites) - South Dakota

 
This is a 2" 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. There is a large, partial Hoploscaphites nicoletti ammonite along one edge of the rock. There is a variety of other marine bivalves and ammonites that have been partially exposed from the rock as well.



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
Scaphites sp. & Hoploscaphites nicoletti
LOCATION
North Central, South Dakota
FORMATION
Fox Hills Formation
SIZE
2" ammonite, 6.8 x 3.9" rock
ITEM
#137292
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