There are 10 matches

Collection Authorizer Collection name Reference
23613S. Holland Glenwood Formation Gastropoda and Monoplacophora, Illinois and Iowa Blackriveran - Ordovician 4-5 - Illinois, Iowa Sloan and Webers (1987)
23614S. Holland Pecatonica Formation Gastropoda and Monoplacophora, Illinois and Iowa Blackriveran - Ordovician 4-5 - Illinois, Iowa Sloan and Webers (1987)
23615S. Holland Mifflin Formation Gastropoda and Monoplacophora, Illinois and Iowa Blackriveran - Ordovician 4-5 - Illinois, Iowa Sloan and Webers (1987)
23621S. Holland Spechts Ferry Formation Gastropoda and Monoplacophora, Illinois and Iowa Blackriveran/Rocklandian - Ordovician 4-5 - Illinois, Iowa Sloan and Webers (1987)
23622S. Holland Guttenberg Formation Gastropoda and Monoplacophora, Illinois and Iowa Rocklandian/Kirkfieldian - Ordovician 4-5 - Illinois, Iowa Sloan and Webers (1987)
23623S. Holland Ion Formation, Buckhorn Member Gastropoda and Monoplacophora, Illinois and Iowa Kirkfieldian - Ordovician 4-5 - Illinois, Iowa Sloan and Webers (1987)
23644S. Holland Ion Formation, St. James Member Gastropoda and Monoplacophora, IL and IA Kirkfieldian - Ordovician 4-5 - Illinois, Iowa Sloan and Webers (1987)
23651S. Holland Dunleith Fm, Beecher Member Member Gastropoda and Monoplacophophora, IL and IA Shermanian - Ordovician 4-5 - Illinois, Iowa Sloan and Webers (1987)
23653S. Holland Dunleith Fm, Eagle Point Member Gastropoda and Monoplacophora, Illinois and Iowa Shermanian - Ordovician 4-5 - Illinois, Iowa Sloan and Webers (1987)
23656S. Holland Dunleith Fm, Fairplay Member Gastropoda and Monoplacophora, Illinois and Iowa Shermanian - Ordovician 4-5 - Illinois, Iowa Sloan and Webers (1987)

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