Classification of Simpson 1927

Fm. †Pantolestidae Cope 1884
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G. †Propalaeosinopa Simpson 1927
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Fm. †Oxyclaenidae Scott 1892
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G. †Elpidophorus Simpson 1927
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†Elpidophorus elegans Simpson 1927
Fm. †Polymastodontidae Cope 1884
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G. †Catopsalis Cope 1882