Classification of Clark 1938
G. Cantharus Röding 1798
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Subg. †Cantharus (Endopachychilus) Cossman 1889
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†Cantharus (Endopachychilus) suturalis Clark 1938
G. †Perse Clark 1918
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†Perse markleyensis Clark 1938
†Perse tuberculatum Clark 1938
G. Pseudoliva Swainson 1840
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†Pseudoliva kirbyi Clark 1938
†Pseudoliva markleyensis Clark 1938
G. Siphonalia Adams 1863
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Subg. Siphonalia (Austrofusus) Kobelt 1879
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Siphonalia (Austrofusus) bicarinata Clark 1938
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Siphonalia (Austrofusus) bicarinata crooki Clark 1938
G. Glycymeris Da Costa 1778
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†Glycymeris eocenica Weaver 1912
†Glycymeris sagittata Gabb 1864
G. Corbicula Megerle 1811
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†Corbicula arnoldi Clark 1938
†Corbicula oldroydi Clark 1938
G. †Elimia Adams and Adams 1858
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†Elimia dickersoni Clark 1938
†Elimia schencki Clark 1938
G. Thiara Röding 1798
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Subg. Thiara (Melanoides) Olivier 1804
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†Thiara (Melanoides) calafi Clark 1938
†Thiara (Melanoides) markleyensis Clark 1938
Subg. †Cantharus (Eocantharus) Clark 1938
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†Cantharus (Eocantharus) cowlitzensis Clark 1938
Subg. Crassatellites (Eucrassatella) Iredale 1924
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†Crassatellites (Eucrassatella) weaveri Clark 1938