4.35" Fossil Ammonite (Jeletzkytes) - South Dakota

This is a 4.35" wide Jeletzkytes spedeni ammonite specimen collected from the Fox Hills Formation of South Dakota. Much of the shell has chipped away and portions of the ammonite are compressed from being within rock for millions of years. What could be considered that back side of the specimen didn't preserve as nicely as the "front side".

Comes with an acrylic display stand.

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 ago and they barely survived several major extinction events. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

Jeletzkytes spedeni
North Central, South Dakota
Fox Hills Formation
Ammonite 4.35" wide
We guarantee the authenticity of all of our
specimens. Read more about our
Authenticity Guarantee.