GeoRef Subject
Chordata
Gregory County South Dakota
Keya Paha County Nebraska
Barstovian
Arikareean
Eutheria
Hemingfordian
Cenozoic
lower Miocene
Mammalia
Nebraska
South Dakota
Fremont County Wyoming
Neogene
Paleogene
paleontology
Tetrapoda
Miocene
Oligocene
Pliocene
Tertiary
United States
Vertebrata
Valentine Formation
Wyoming
Theria
Shannon County South Dakota
Brule County South Dakota
Rodentia
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