Classification of Sternberg 1945
Subor. †Ornithopoda Marsh 1881 [ornithopod]
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Fm. †Pachycephalosauridae Sternberg 1945
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G. †Pachycephalosaurus Brown and Schlaikjer 1943
G. †Stegoceras Lambe 1902
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†Stegoceras brevis Lambe 1918
†Stegoceras lambei Sternberg 1945
†Stegoceras sternbergi Brown and Schlaikjer 1943
†Stegoceras validus Lambe 1902
Fm. †Troodontidae Gilmore 1924
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