| details |
Late Pennsylvanian |
|
Nd |
Millay,M.A. et al. Evolutionary trends in fossil Gymnosperm pollen |
1976 |
| details |
Late Mississippian |
Permian |
Nd |
Millay,M.A. et al. Paleozoic seed fern pollen organs. |
1979 |
| details |
Late Carboniferous |
|
W.Germany(N.Rhine) |
Potonie,R. et al. The genera of Paleozoic sporae dispersae and their stratigraphy. |
1954 |
| details |
Gipskeuper |
|
Switzerland |
Scheuring,B.W. Palynology and palynostratigraphic study of the Keuper in Bolchentunnel, (Solothurn Jura). |
1970 |
| original |
Desmoinesian |
|
Illinois |
Schopf,J.M. Spores from the Herrin (No. 6) Coal Bed in Illinois. |
1938 |
| details |
Desmoinesian |
|
North America |
Frederiksen,N.O. The Rise of the Mesophytic flora |
1972 |
| details |
Carboniferous |
|
Nd |
Millay,M.A. et al. Paleozoic seed fern pollen organs. |
1979 |