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Author - title
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| details | Late Oligocene | Early Miocene | USSR(Ukrainian SSR) | Shchekina,N.A. Flora of Brown Coal and Carbonaceous Clays from the Lower Part of the Poltava Suite of the environs of Kiev by spore Nd pollen analysis | 1962 |
| details | Early Eocene | USSR(Vologda) | Kuznetsova,T.A. Palynologic characteristics of the Tsaritsyn Suite of the Lower Volga. | 1974 | |
| details | Middle Eocene | Early Oligocene | Russia(Kaliningrad) | Vialov,O.S. et al. Region I. The Western Russian, (East European), Platform, (Lithuania, Byelorussia and Kaliningrad Region of Russia). (In: Late Eocene-Early Oligocene geological and Biotical events on the Territory of the Former Soviet Union.Part 1: The regional geology of the Upper Eocene and Lower Oligocene. V.A.Krasheninnikov and M.A.Akhmetiev, editors) | 1996 |