Classification of Cope 1890
Fm. Sirenia Illiger 1811 [sirenian]
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Fm. †Halitheriidae Gill 1872
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G. †Anoplonassa Cope 1869
G. †Dioplotherium Cope 1883
G. †Halitherium Kaup 1838
G. †Hemicaulodon Cope 1869
G. †Miosiren Dollo 1889
Invalid names: Halicoridae Gray 1825 [empty], Rhytinidae Gill 1872 [empty]