Unprepped Oligocene Mammal Fossils in Rock - South Dakota

This is a 3.5" wide cluster of Oligocene age mammal bones in rock. It was collected from the the Brule Formation in South Dakota and the fossils would be approximately 30-34 million years old. The exposed bones include a partial jaw, skull pieces, a partial limb bone, and a small but complete phalange bone.

This specimen could make for a cool display piece, or even be a nice fossil prep project. There's no telling what other bones could be hiding within this rock!

Oreodonts are an extinct mammal most closely related to camels and pigs. They have no close relatives living today. They were herbivorous, with short faces and fang-like canine teeth. About the size of a sheep, they roamed the plains of North America in huge numbers during the Oligocene period.