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

This is a 1.4" ammonite (Discoscaphites conradi) 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. The rock contains a variety of other small marine bivalves and ammonite pieces. There is a repaired crack through the ammonite.

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.

Discoscaphites conradi
North Central, South Dakota
Fox Hills Formation
1.4" ammonite, 3.4 x 3.3" rock
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