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Fossil collection records
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Classification of Erickson 1987
Subor. †
Choristodera
Cope 1876 [choristodere]
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Fm. †
Champsosauridae
Cope 1876 [champsosaur]
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G. †
Simoedosaurus
Gervais 1877
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†
Simoedosaurus dakotensis
Erickson 1987