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| details | Valanginian | USSR(Chitinskaya Oblast) | Bondarenko,N.M. et al. A list of plant spores and pollen of Valanginian deposits in some districts of the USSR. (In: Atlas of Lower Cretaceous spore-pollen complexes of some regions of USSR. I.M.Pokyovsksys and N.K.Stel'mak, editors) | 1964 |