Classification of Gazin and Collins 1950

Fm. Canidae Fischer de Waldheim 1817 [canid]
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G. †Tomarctus Cope 1873
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†Tomarctus marylandica Berry 1938
Fm. Tayassuidae Palmer 1897 [peccary]
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G. †Cynorca Cope 1867
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†Cynorca proterva Cope 1867
G. †Hesperhys Douglass 1903
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Subg. †Hesperhys (Desmathyus) Matthew 1907
Fm. Equidae Gray 1821 [horse]
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G. †Archaeohippus Gidley 1906
G. †Merychippus Leidy 1856
Fm. Tapiridae Gray 1821 [tapir]
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G. †Tapiravus Marsh 1877
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†Tapiravus validus Marsh 1871
Fm. Rhinocerotidae Gray 1821 [rhinoceros]
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G. †Aphelops Owen 1845
Fm. †Gomphotheriidae Hay 1922 [gomphothere]
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G. †Gomphotherium Burmeister 1837
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†Gomphotherium calvertensis Gazin and Collins 1950