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| details | Middle Eocene | Early Oligocene | Russia(Yakutia) | Fradkina,A.F. et al. Region XXIV. The Russian North-East, (Yakuita and the Chukchi Peninsula). (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 |