| original |
Early Oligocene |
|
USSR(WSL) |
Ushakova,M.V. et al. Lower Oligocene. (In: Stratigraphy of the Mesozoic and Cenozoic of the Western Siberian Lowlands. V.F.Kozyreva, editor) |
1957 |
| original |
Miocene |
|
USSR(Yakut ASSR) |
Zyryanov,E.V. Palynological investigations of Miocene deposits on the new Siberian Archipelago (USSR). |
1992 |
| original |
Santonian |
Maastrichtian |
USSR(Yamalo-Nenets) |
Bondarenko,N.M. Palynological basis of stratigraphic differential on of Upper Cretaceous deposits discovered in bore holes from drill cores of the Ob Bay District. (In: Paleontology and Biostratigraphy of the Soviet Arctic. #2. N.A.Shvedov, editor) |
1961 |