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Part of a Hyracodon jaw, approximately 10.5 x 6 cm, containing fossilized bone and several teeth.
Hyracodon ("hyrax tooth"), although closely resembling a primitive horse, is actually a form of prehistoric rhinoceros. They lived from the Lutetian (Eocene) to the Aquitanian (Miocene) in North America.
Oligocene, Brule Formation
Shannon County, South Dakota, USA