| original |
Middle Valanginian |
Early Hauterivian |
Germany |
Dжring,H. Stratigraphic distribution of the spore genera Gleicheniidites and Trubasporites in the Jurassic-Cretaceous transition |
1965 |
| details |
Valanginian |
Aptian |
E.Germany |
Dжring,H. The stratigraphic classification of spores from the Lower Cretaceous of northern Central Europe. |
1966 |
| details |
Middle Aptian |
|
Austria |
Corna,O. Palynological study and nannofossils. (In: Study of the Lower Cretaceous of the Vienna Woods. Grun et al) |
1972 |
| details |
Valanginian |
|
Europe |
Dжrhжfer,G. Distribution and stratigraphic utility of Oxfordian to Valanginian miospores in Europe and North America. |
1976 |