Classification of Albright 1999
†Cynorca proterva Cope 1867
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†Dinohyus mento Allen 1926
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Fm. †Entelodontidae Lydekker 1883
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Invalid names: Boochoerus Cope 1879 [nomen vanum], Boochoerus humerosus Cope 1879 [nomen vanum], Daeodon Cope 1878 [nomen vanum]
Fm. Tayassuidae Palmer 1897 [peccary]
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Fm. †Protoceratidae Marsh 1891 [protoceratid]
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G. †Prosynthetoceras Frick 1937
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†Prosynthetoceras orthrionanus Albright 1999
†Prosynthetoceras texanus Hay 1924
Fm. Equidae Gray 1821 [horse]
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Fm. Rhinocerotidae Gray 1821 [rhinoceros]
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G. †Diceratherium Marsh 1875
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†Diceratherium annectens Marsh 1873
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Invalid names: Diceratherium cuspidatum Troxell 1921 [synonym], Diceratherium nanum Marsh 1875 [synonym]
†Diceratherium armatum Marsh 1875
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Invalid names: Diceratherium lobatum Troxell 1921 [synonym]
†Menoceras barbouri Wood 1964
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Invalid names: Menoceras marslandensis Tanner 1969 [synonym]
†Nanotragulus loomisi Lull 1922
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Invalid names: Nanotragulus intermedius Schlaikjer 1935 [synonym], Nanotragulus lulli Frick 1937 [synonym]