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| details | Berriasian | Early Valanginian | USSR(Kazakh SSR) | Shakhmundes,V.A. Lower Cretaceous microphytoplankton of the northern Pre-Caspian and their significance for stratigraphy and paleogeogaphy. (In: Microfossils USSR. T.F.Vozzhennikova et al, editors) | 1974 |