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Spirifer

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)
<i>Spirifer rockymontanus</i> from an unknown formation in the Magdalena Group of New Mexico (KUMIP 222911).
Spirifer rockymontanus from an unknown formation in the Magdalena Group of New Mexico (KUMIP 222911).