Species of Spirifer present in the Pennsylvanian of the American Midcontinent
Desmoinesian to Virgilian; Extinct.
Texas to Kansas.
- Graham Formation (Wayland Shale Member) (TX)
- Harpersville Formation (TX)
- Drum Limestone (KS)
- Big Branch Formation (Pumpkin Creek Limestone Member) (OK)
- Cabaniss Formation (KS)
- Cabaniss Formation (Verdigris Limestone Member) (KS)
- Millsap Lake Formation (TX)
- Unknown Stage
- Magdalena Limestone (NM)
- Marble Falls Limestone (TX)