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Part of the mandible with bone measuring ± 3 x 2.5 cm.
*Mesohippus was an extinct genus of perissodactyl mammals of the family Equidae and the subfamily Anchitheriinae. They had 3 fingers and lived approximately 40 million years ago, in the Middle Oligocene of North America.?
Oligocene, White River Badlands Formation
Pennington Co.,South Dakota (USA)