| original |
Middle Oligocene |
|
USSR(WSL) |
Voitsel,Z.A. Juglandaceae. (In: Pyltsa i spory zapadnoi Sibiri, yura-paleotsen. S.R.Samoilovich and N.D.Mtchedlishvili, editors) |
1961 |
| details |
Early Oligocene |
Middle Oligocene |
USSR |
Aristova,K.E. Pollen and microplankton from boundary Eocene and Oligocene deposits in the southern part of the USSR. |
1971 |
| details |
Early Oligocene |
Middle Oligocene |
USSR |
Aristova,K.E. Pollen and microplankton from the Eocene-Oligocene boundary deposits in the Southern Part of the USSR |
1973 |
| details |
Late Eocene |
Oligocene |
USSR(Kazakh SSR) |
Zhezhel,O.N. The boundary between Eocene and Oligocene deposits at North Ustyurt (according to palynological data). (In: Palynology, Method and Stratigraphy) |
1973 |
| details |
Oligocene |
|
USSR(Krasnoyarsk Kray) |
Kulkova,I.A. et al. New data on the palynology of Oligocene formations of the Balsko-Rybinka Basin (Lower Angara). (In: Palynology of the Cenozoic of Siberia. V.S.Volkova, editor) |
1975 |
| details |
Oligocene |
Miocene |
USSR(Siberia) |
Volkova,V.S. et al. Palynological characteristic of Neogene deposits of the Western Siberian Plain. (In: Palynology of the Cenozoic of Siberia. V.S.Volkova, editor) |
1975 |