Classification of Bjork 1967

Fm. Emydidae Rafinesque 1815
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G. Graptemys Agassiz 1857 [map turtle]
Fm. Alligatoridae Gray 1844
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G. †Allognathosuchus Mook 1921
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†Allognathosuchus riggsi Patterson 1931
Fm. Equidae Gray 1821 [horse]
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G. †Epihippus Marsh 1878
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†Epihippus intermedius Peterson 1932
Fm. †Brontotheridae Marsh 1873 [brontothere]
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G. †Teleodus Marsh 1890
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†Teleodus thyboi Bjork 1967
Fm. †Amynodontidae Scott and Osborn 1883
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G. †Amynodontopsis Stock 1933
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†Amynodontopsis bodei Stock 1933
Fm. Lepisosteidae Cuvier 1825
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G. Lepisosteus Agassiz 1843
Fm. †Helaletidae Osborn 1892
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G. †Colodon Marsh 1890
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†Colodon cingulatus Douglass 1902