| details |
Late Carboniferous |
|
W.Germany(N.Rhine) |
Lachkar,G. New definitions of the megaspore genera Valvisisporites and Pseudovalvisisporites and their principal species. |
1968 |
| details |
Early Westphalian B |
Middle Westphalian C |
W.Germany(N.Rhine) |
Potonie,R. et al. The spore dispersae of the Rhur Carboniferous, their morphography and stratigraphy with reviews of species of other areas.Part 2 |
1956 |
| details |
Early Westphalian C |
|
Germany |
Schopf,J.M. et al. An annotated synopsis of Paleozoic fossil spores and the definition of generic groups. |
1944 |
| original |
Late Carboniferous |
|
W.Germany(N.Rhine) |
Stach,E. et al. Spores in the Flame, Gasflame and Gascoal of the Ruhr Coal. |
1931 |