Species of Dunbarella present in the Pennsylvanian of the American Midcontinent
Desmoinesian to Virgilian; Extinct.
Kansas to Nebraska.
- Calhoun Shale (KS)
- Lawrence Shale (Wathena Shale Member) (KS)
- Zeandale Limestone (Wamego Shale Member) (NE)
- Dennis Limestone (Winterset Limestone Member) (MO)
- Carbondale Formation (Energy Shale Member) (IL)
- Croweburg Formation (KS)