Trachydomia

Geological Range

Atokan to Virgilian; Extinct.

Paleogeographic Distribution

Texas to Nebraska.

Stratigraphic Occurrences

Virgilian

Gaptank Formation (TX)

Kanwaka Shale (Stull Shale Member) (KS)

Oread Limestone (Leavenworth Limestone Member) (KS)

Oread Limestone (Toronto Limestone Member) (KS)

Tecumseh Shale (KS)

Missourian

Drum Limestone (KS)

Graford Formation (Brownwood Shale Member) (TX)

Hertha Limestone (Critzer Limestone Member) (KS)

Plattsburg Limestone (KS)

Plattsburg Limestone (MO)

Plattsburg Limestone (Spring Hill Limestone Member) (KS)

Stanton Limestone (Stoner Limestone Member) (KS)

Vilas Shale (KS)

Desmoinesian

Cabaniss Formation (Chelsea Sandstone Member) (KS)

Lake Murray Formation (Frensley Member) (OK)

Millsap Lake Formation (TX)

Millsap Lake Formation (Dickerson Member) (TX)

Savanna Formation (Sam Creek Limestone Member) (OK)

Atokan

Atoka Formation (OK)

Unknown Stage

Coal Measures (MO)

Coal Measures (NE)