| details |
Kungurian |
|
USSR(Komi ASSR) |
Hart,G.F. The biostratigraphy of Permian palynofloras. |
1970 |
| details |
Ufimian |
Kazanian |
USSR(Russian Platform) |
Varyukhina,L.M. Spores and pollen of the red-colored coal-bearing Permian and Triassic sediments of the northeastern part of European SSSR. |
1971 |
| original |
Frasnian |
|
USSR(Belorussian SSR) |
Kedo,G.I. New species of spores from the Upper Devonian of the Pripyat Depression. (In: Paleozoic spores of Belorussia (Pripyat Depression.) |
1974 |
| details |
Late Devonian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |