| details |
Early Permian |
|
USSR(Urals) |
Abramova,S.A. et al. Palynological investigations of Upper Kama's potassium deposits, underlying Kungurian Salt Layers. |
1960 |
| details |
Early Kazanian |
|
USSR(European) |
Zoricheva,A.I. et al. Spore-pollen complexes of Upper Permian deposits of various Regions of the North of the European part of the USSR. |
1954 |
| details |
Early Cambrian |
|
USSR(Russian Platform) |
Naumova,S.N. Spore complexes of the Riphean and Lower Cambrian in the USSR |
1961 |
| details |
Carboniferous |
Permian |
Finland |
Suomalainen,T. et al. Pre-Quaternary microfossils in Clay occurrences of Kaljala on the Karelian Isthmus. |
1970 |