| original |
Early Permian |
Late Permian |
USSR(Pre-Urals) |
Lyuber,A.A. et al. Atlas of microspores and pollen of the Paleozoic of the USSR. |
1941 |
| details |
Late Tatarian |
|
USSR(Kirov) |
Olferev,A.G. On the correlation of Stratotypic sections of the Upper Tatavian Substage |
1974 |
| details |
Kungurian |
Kazanian |
USSR(Urals) |
Samoilovich,S.R. Pollen and spores of Permian deposits of Cherdyn and Aktyubinsk in the Lower Urals. (In: Palaeobotanical Symposium) |
1953 |
| details |
Kungurian |
Ufimian |
USSR(Permsk Oblast) |
Sivertseva,I.A. The spore-pollen complexes of the Kungurian and Ufimian Stages of the Solikamian Region |
1969 |
| details |
Permian |
|
USSR(Urals) |
Zauer,V.V. The Permian flora of Solikamsk |
1965 |