Classification of Holman 1973

G. Amblystoma Tschudi 1838 [mole salamander]
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†Amblystoma minshalli Tihen and Chantell 1963
G. Scaphiopus Holbrook 1836 [spadefoot toad]
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†Scaphiopus alexanderi Zweifel 1956
G. Bufo Laurenti 1768
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†Bufo hibbardi Taylor 1936
†Bufo kuhrei Holman 1973
†Bufo valentinensis Estes and Tihen 1964
G. Geochelone Fitzinger 1835
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†Geochelone nordensis Holman 1973
†Geochelone orthopygia Cope 1878
Fm. Xenosauridae Cope 1866
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G. †Nordenosaurus Holman 1973
Fm. Colubridae Oppel 1811 [colubrid snake]
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G. †Paleoheterodon Holman 1964
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†Paleoheterodon tiheni Holman 1964
G. Elaphe Wagler 1833
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†Elaphe nebraskensis Holman 1964