| original |
Desmoinesian |
|
Illinois |
Peppers,R.A. Correlation and palynology of coals in the Carbondale and Spoon Formations (Pennsylvanian) of the northeastern part of the Illinois Basin. |
1970 |
| details |
Middle Pennsylvanian |
|
Illinois |
Stidd,B.M. An Anatomically preserved Potoniea with in situ, spores from the Pennsylvanian of Illinois. |
1978 |
| details |
Pennsylvanian |
|
Iowa |
Ravn,R.L. An introduction to the stratigraphic palynology of the Cherokee Group (Pennsylvanian) coals of Iowa. |
1979 |
| details |
Middle Pennsylvanian |
|
Iowa |
Ravn,R.L. Palynostratigraphy of the Lower and Middle Pennsylvanian Coals of Iowa |
1986 |
| details |
Late Carboniferous |
|
Euramerica |
Dimichele,W.A. et al. Paleobotanical and paleoecological constraints on models of Peat Formation in the Late Carboniferous of Euramerica |
1994 |