Ianthinopsis

Geological Range

Morrowan to Virgilian; Extinct.

Paleogeographic Distribution

Texas to Illinois.

Stratigraphic Occurrences

Virgilian

Emporia Limestone (OK)

Gaptank Formation (TX)

Graham Formation (Wayland Shale Member) (TX)

Graham Formation (Gunsight Limestone Member) (TX)

Graham Formation (Jacksboro Limestone Member) (TX)

Graham Formation (Finis Shale Member) (TX)

Harpersville Formation (Waldrip Shale Member) (TX)

Howard Formation (KS)

Kanwaka Shale (KS)

Kanwaka Shale (Stull Shale Member) (KS)

Oread Limestone (KS, NE)

Oread Limestone (Toronto Limestone Member) (KS)

Stranger Formation (OK)

Stranger Formation (Weston Shale Member) (KS)

Topeka Limestone (KS)

Wood Siding Formation (Brownville Limestone Member) (OK)

Missourian

Bonner Springs Shale (KS)

Brad Formation (TX)

Checkerboard Formation (KS)

Cherryvale Shale (Westerville Limestone Member) (KS)

Drum Limestone (KS)

Graford Formation (TX)

Graford Formation (Brownwood Shale Member) (TX)

Hertha Limestone (KS)

Hogshooter Formation (OK)

Iola Limestone (KS)

Iola Limestone (Avant Limestone Member) (OK)

Iola Limestone (Muncie Creek Shale Member) (OK)

Iola Limestone (Raytown Limestone Member) (KS)

Keechi Creek Formation (TX)

Lane Shale (KS)

Ochelata Formation (OK)

Plattsburg Limestone (Spring Hill Limestone Member) (KS)

Stanton Limestone (OK, KS)

Stanton Limestone (Eudora Shale Member) (OK)

Stranger Formation (MO)

Vilas Shale (OK)

Wyandotte Limestone (KS)

Wyandotte Limestone (Argentine Limestone Member) (KS)

Desmoinesian

East Mountain Shale (TX)

Fort Scott Limestone (KS)

Holdenville Shale (OK)

Labette Shale (MO)

Millsap Lake Formation (TX)

Millsap Lake Formation (Grindstone Creek Member) (TX)

Mineral Wells Formation (TX)

Mingus Shale (TX)

Salesville Shale (TX)

Wewoka Formation (OK)

Atokan

Atoka Formation (OK)

Morrowan

Marble Falls Limestone (TX)

Marble Falls Limestone (Sloan Member) (TX)

Unknown Stage

Bourbon Formation (KS)

Coal Measures (IL)

Coal Measures (KS)

Coal Measures (MO)