Spirifer

Geological Range

Desmoinesian to Virgilian; Extinct.

Paleogeographic Distribution

Texas to Kansas.

Stratigraphic Occurrences

Virgilian

Graham Formation (Wayland Shale Member) (TX)

Harpersville Formation (TX)

Missourian

Drum Limestone (KS)

Desmoinesian

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)