| details |
Hauterivian |
Barremian |
USSR(WSL) |
Ivanova,E.A. et al. Hauterivian-Barremian spore-pollen complexes. (In: Stratigraphy of the Mesozoic and Cenozoic of the Western Siberian Lowlands. V.F.Kozyreva, editor) |
1957 |
| details |
Hauterivian |
Barremian |
USSR(WSL) |
Filippova,E.A. Hauterivian - Barremian. (In: Stratigraphy of Mesozoic and Cenozoic Periods of Western Siberian Lowland. E.A.Filippova, editor) |
1957 |
| details |
Aptian |
|
USSR(Ukrainian SSR) |
Chuprin,N.E. et al. New facts about stratigraphy of Lower Cretaceous sediments from the Southwestern Part of the Dneprovo-Donets Lowland. |
1963 |