Classification of Cione et al. 2000
Fm. Dinomyidae Peters 1873
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G. †Briaromys Ameghino 1889
G. †Carlesia Kraglievich 1926
G. †Doellomys Alvarez 1947
G. †Eumegamysops Alvarez 1947
G. †Paranamys Kraglievich 1934
G. †Pentastylodon Alvarez 1947
G. †Pentastylomys Kraglievich 1926
G. †Protomegamys Kraglievich 1932
G. †Pseudosigmomys Kraglievich 1931
G. †Tetrastylomys Kraglievich 1926
Fm. Caviidae Gray 1821
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G. †Cardiomys Ameghino 1885
G. †Pliodolichotis Kraglievich 1927
G. †Palaeotoxodon Ameghino 1904
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Invalid names: Palaeotoxodon protoburmeisteri Ameghino 1887 [nomen dubium]
Subfm. †Megatheriinae Gill 1872
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Subfm. †Mylodontinae Gill 1872
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G. †Prolestodon Kraglievich 1932
G. †Promylodon Ameghino 1883
G. †Ranculcus Ameghino 1891
Subfm. †Macraucheniinae Gervais 1855
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G. †Paranauchenia Ameghino 1904
G. †Scalabrinitherium Ameghino 1883
Fm. Sciaenidae Cuvier 1828
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Subfm. †Toxodontinae Owen 1837
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