| details |
Ufimian |
|
USSR(Permsk Oblast) |
Sivertseva,I.A. et al. Spore and pollen complexes of some Permian horizons of Upper Petchora Depression |
1972 |
| 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 |
Kazanian |
Tatarian |
USSR(Permsk Oblast) |
Egorova,V.N. Kazanian spore-pollen complex Kamskoye-Meshinskogo Interfluve. (In: Biostratigraphy and Paleontology of Paleozoic Deposits of the Eastern Part of the Russian Platform and Western Priuralye. A.K.Gusev, editor) |
1970 |