| original |
Westphalian D |
|
France(Alsace) |
Venkatachala,B.S. On some new spore genera from the Upper Carboniferous Coals of Lothringen-Saar-Pfalz Basin. |
1963 |
| original |
Westphalian D |
|
W.Germany(Saarland) |
Venkatachala,B.S. On some new spore genera from the Upper Carboniferous Coals of Lothringen-Saar-Pfalz Basin. |
1963 |
| details |
Early Stephanian |
|
France(Lorraine) |
Venkatachala,B.S. et al. Sporological study of the coals from Falkenberg (Faulquemont) Colliery, Lothringen (Lorrain) France. |
1964 |
| details |
Atokan |
|
Iowa |
Ravn,R.L. Palynostratigraphy of the Lower and Middle Pennsylvanian Coals of Iowa |
1986 |