| details |
Valanginian |
|
USSR(WSL) |
Markova,L.G. et al. Spores and pollen of the Lower Cretaceous layers of the Turukhansk borehole. |
1960 |
| details |
Liassic |
|
Poland |
Rogalska,M. Spore and pollen analysis of the Liassic deposits of the Mroczkow-Rozwady area in the Opoczno Distri Ct. |
1956 |
| details |
Early Jurassic |
|
Poland |
Rogalska,M. Spore and pollen analysis of the Liassic Coal of Blanowice in Upper Silesia |
1954 |
| details |
Recent |
|
Nd |
Knox,E.M. The spores of Pteridophyta, with observations on microspores in Coals of Carboniferous age. |
1939 |