This image is of an Audouliceras renauxianum (d'Orbigny 1842) ammonite fossil. The animal existed in the Cretaceous Period. Fossil was ...

This image is of a Didymoceras nebrascense (Meek and Hayden, 1856) ammonite fossil. The animal existed in the Campanian age of the Late Cre...

This image is of an Archaeocidaris sea urchin fossil. The animal existed in the Carboniferous Period. Fossil was discovered in Brown Count...