Classification of Gilmore 1935
Fm. †Baenidae Cope 1882
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Fm. Trionychidae Gray 1825 [softshell turtle]
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Fm. †Hadrosauridae Cope 1869 [hadrosaurid]
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Subfm. †Hadrosaurinae Lambe 1918 [hadrosaurine]
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Subfm. †Lambeosaurinae Parks 1923 [lambeosaurine]
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Fm. †Ceratopsidae Marsh 1888 [ceratopsid]
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G. †Chasmosaurus Lambe 1914
G. †Pentaceratops Osborn 1923
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†Pentaceratops fenestratus Wiman 1930
†Pentaceratops sternbergii Osborn 1923