Call Us: 1-866-354-0894

FO311 Didymoceras

FO311 Didymoceras


This is a nice section of a Didymoceras cheyenense from Pennington County in South Dakota.  This section of the fossil has great detail including some reddish iridescence showing on the ribbed and bumpy outer surface.  This nice fossil Didymoceras cheyenense measures 3 3/4″ x 2 3/8″ x 2 1/2.  Close inspection shows some professional repair.  Nice fossils like this can be hard to come by; add this fine example to your fossil collection!

In stock


Didymoceras is an extinct genus of ammonite cephalopod from the Late Cretaceous Period, 74.3 million years ago. The generic name is Latin for “paired horns”. It is one of the most bizarrely shaped genera, with a shell that spirals upwards into a loose, hooked tip. It is believed to have drifted in the water vertically, moving up and down.

Additional information

Weight1 lbs
Dimensions3.75 × 2.375 × 2.5 in

Contact Us

515 1st Street
Keystone, SD 57751

Order: 1-866-354-0894
Information: 605-666-4813

Find Us On Social