Classification of Hatcher et al. 1907
Or. Theropoda Marsh 1881 [theropod]
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Fm. †Stegosauridae Marsh 1880
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Invalid names: Dysganus peiganus Cope 1876 [nomen nudum]
Or. Dinosauria Owen 1842 [dinosaur]
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Or. †Predentata Marsh 1894
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Subor. †Ceratopsia Marsh 1890 [ceratopsian]
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Fm. †Ceratopsidae Marsh 1888 [ceratopsid]
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G. †Agathaumas Cope 1872
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†Agathaumas sylvestris Cope 1872
Invalid names: Agathaumas milo Cope 1874 [nomen nudum]
G. †Ceratops Marsh 1888
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†Ceratops belli Lambe 1902
†Ceratops canadensis Lambe 1902
†Ceratops montanus Marsh 1888
†Ceratops paucidens Marsh 1889
†Ceratops recurvicornis Cope 1889
G. †Monoclonius Cope 1876
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†Monoclonius crassus Cope 1876
†Monoclonius dawsoni Lambe 1902
†Monoclonius sphenocerus Cope 1889
G. †Triceratops Marsh 1889
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†Triceratops alticornis Marsh 1887
†Triceratops brevicornus Hatcher and Lull 1905
†Triceratops calicornis Marsh 1898
†Triceratops elatus Marsh 1891
†Triceratops flabellatus Marsh 1889
†Triceratops horridus Marsh 1889
†Triceratops obtusus Marsh 1898
†Triceratops prorsus Marsh 1890
†Triceratops serratus Marsh 1890
†Triceratops sulcatus Marsh 1890
Invalid names: Sterrholophus Marsh 1891 [synonym]
Invalid names: Agathaumidae Cope 1889 [synonym], Monoclonius fissus Cope 1889 [nomen nudum], Polyonax Cope 1874 [nomen dubium]
Fm. †Trachodontidae Lydekker 1888
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Subor. †Ornithischia Seeley 1888 [ornithischian]
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Invalid names: Dysganus Cope 1876 [nomen nudum]