| original |
Allegheny |
|
Pennsylvania |
Habib,D. Distribution of spore and pollen assemblages in the Lower Kittanning Coal of Western Pennsylvania |
1966 |
| details |
Pennsylvanian |
|
Illinois |
Peppers,R.A. et al. A comparison of the floras of the Colchester (No.2) Coal and Francis Creek Shale. (In: Depositional environments in parts of the Carbondale Formation: Western and northern Illinois) |
1970 |
| details |
Nd |
|
Nd |
Potonie,R. Synopsis of the genera of the sporae dispersae. Part 5. Supplement to all Groups (Turmae). |
1970 |
| details |
Middle Pennsylvanian |
|
Iowa |
Ravn,R.L. Palynostratigraphy of the Lower and Middle Pennsylvanian Coals of Iowa |
1986 |