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Author - title
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Year
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| details | Early Oligocene | USSR | Aristova,K.E. Pollen and microplankton from the Eocene-Oligocene boundary deposits in the Southern Part of the USSR | 1973 | |
| details | Early Oligocene | Russia(Caucasus) | Zaporozhets,N.I. Lower Oligocene palynology and phytoplankton of the northern Caucasus | 1993 | |
| details | Early Oligocene | Russia(Caucasus) | Krasheninnikov,V.A. et al. Reference sections of the Eocene - Oligocene boundary strata on the territory of the former Soviet Union. The Kuban River section (Northern Caucasus, Russia). (In: Late Eocene-Early Oligocene geological and Biotical events on the Territory of the Former Soviet Union.Part 2: The Regional Geology of the Upper Eocene and Lower Oligocene. (V.A.Krasheninnikov and A.Akhmetiev, editors) | 1996 |