| original |
Pennsylvanian |
|
Iowa |
Ravn,R.L. An introduction to the stratigraphic palynology of the Cherokee Group (Pennsylvanian) coals of Iowa. |
1979 |
| details |
Morrowan |
Desmoinesian |
Iowa |
Ravn,R.L. Paleobotanical relationships and stratigraphic importance of the Carboniferous miospora genus Vestispora and questionably allied genera |
1983 |
| details |
Westphalian B |
|
Europe |
Butterworth,M.A. Upper Carboniferous. (In: Pollen and Spore Biostratigraphy of the Phanerozoic in Northwest Europe) |
1984 |
| details |
Middle Pennsylvanian |
|
Iowa |
Ravn,R.L. Palynostratigraphy of the Lower and Middle Pennsylvanian Coals of Iowa |
1986 |
| details |
Desmoinesian |
|
Illinois |
de Wet,C.B. et al. Disrupted coal and carbonate facies within two Pennsylvanian cyclothems, Southern Illinois Basin, United States |
1997 |
| details |
Desmoinesian |
|
Illinois |
de Wet,C.B. et al. Disrupted coal and carbonate facies within two Pennsylvanian cyclothems, southern Illinois basin, United States. |
1997 |