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| details | Berriasian | Valanginian | USSR(Irkutskaya Oblast) | Fedorova,V.A. et al. Palynostratigraphy of the boundary deposits of the Jurassic and Cretaceous at Oka River. (In: Pogranichnye Varusy Yurskoi i Melovoi Sistem) | 1984 |