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

This is a 1.85" ammonite (Discoscaphites conradi) from the Fox Hills Formation of South Dakota. The iridescence of the outer shell creates a colorful display.

These 70 million year old ammonites lived when South Dakota was a shallow inland sea. It was found preserved in a concretion that was split open. It then had to be hand prepared to remove the hard rock surrounding it from the shell, a very time consuming task.

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. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

FOR SALE
$45
DETAILS
SPECIES
Discoscaphites conradi
LOCATION
North Central, South Dakota
FORMATION
Fox Hills Formation
SIZE
1.85" ammonite
ITEM
#155426
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