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| details | Late Eocene | Russia(Siberia) | Akhmeteev,M.A. et al. Late Eocene and Lower Oligocene land flora and vegetation (leaf flora, spores, pollen). (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 |