Stock Photo - Brontotherium leidyi, Skull and Lower Jaw (12 inch ruler), Early Oligocene, Chadron Formation, Squaw Creek, Nebraska, Phil Degginger/Carnegie Museum

Stock Photo: Brontotherium leidyi, Skull and Lower Jaw (12 inch ruler), Early Oligocene, Chadron Formation, Squaw Creek, Nebraska, Phil Degginger/Carnegie Museum.

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