| details |
Lutetian |
|
USSR(WSL) |
Kulkova,I.A. Eocene plant microfossils of West Siberia. (In: Mikrofitofossilii i stratigrafiya Mezozzoya i Kainozoya Sibiri. S.B. Shatskiy, editor) |
1988 |
| details |
Early Oligocene |
Middle Oligocene |
USSR(Ukrainian SSR) |
Panova,L.A. The Oligocene of the West Siberian Lowland. (In: Cenozoic Flora of Siberia According to Palynological Data. V.N.Sacks and V.S.Volkova, editors) |
1971 |
| details |
Cenomanian |
|
USSR(Kazakh SSR) |
Boytsova,E.P. Upper Cretaceous spore-pollen complexes of the Turgay Depressions. (In: Atlas of Upper Cretaceous, Paleocene and Eocene spore-pollen complexes of various Regions of the USSR). |
1960 |