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Derbyia crassa

Geological Range

Desmoinesian to Virgilian; Extinct.

Paleogeographic Distribution

Texas to Iowa.

Stratigraphic Occurrences

Virgilian
Graham Formation (Wayland Shale Member) (TX)
Howard Formation (Church Limestone Member) (KS)
Missourian
Bonner Springs Shale (KS)
Chanute Shale (MO)
Checkerboard Formation (OK, KS)
Cherryvale Formation (IA)
Cherryvale Formation (Fontana Shale Member) (IA)
Cherryvale Shale (MO)
Coffeyville Formation (OK)
Dennis Limestone (Stark Shale Member) (KS)
Dennis Limestone (Winterset Limestone Member) (KS, MO)
Drum Limestone (KS)
Hertha Limestone (KS)
Hertha Limestone (MO)
Hertha Limestone (Mound City Shale Member) (KS)
Iola Limestone (KS)
Iola Limestone (Raytown Limestone Member) (KS)
Iola Limestone (Raytown Limestone Member) (MO)
Plattsburg Limestone (Spring Hill Limestone Member) (KS)
Stanton Limestone (KS)
Stanton Limestone (Eudora Shale Member) (KS)
Stanton Limestone (Stoner Limestone Member) (KS)
Swope Limestone (Bethany Falls Limestone Member) (KS)
Swope Limestone (Middle Creek Limestone Member) (KS)
Vilas Shale (KS)
Wyandotte Formation (Frisbie Limestone Member) (MO)
Wyandotte Limestone (Farley Limestone Member) (KS)
Desmoinesian
Altamont Limestone (KS)
Virgillian Map
Virgillian Map
Missourian Map
Missourian Map
Desmoinesian Map
Desmoinesian Map