| original |
Late Pennsylvanian |
|
Illinois |
Peppers,R.A. Palynology of the McLeansboro Group of Illinois and equivalent strata of Western Kentucky |
1961 |
| original |
Late Pennsylvanian |
|
Kentucky |
Peppers,R.A. Palynology of the McLeansboro Group of Illinois and equivalent strata of Western Kentucky |
1961 |
| original |
Conemaugh |
Monongahela |
Kentucky |
Peppers,R.A. Spores in strata of Late Pennsylvanian cyclothems in the Illinois Basin. |
1964 |
| details |
Late Pennsylvanian |
|
Kentucky |
Smith,A.H.V. Genus Verrucosisporites, Ibrahim,1933, emend. |
1971 |
| details |
Nd |
|
Nd |
Ravn,R.L. Palynostratigraphy of the Lower and Middle Pennsylvanian Coals of Iowa |
1986 |