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| details | Early Frasnian | USSR(Kirov) | Arkhangelskaya,A.D. et al. A brief palynological characterization of Middle Devonian and the Lower Part of Upper Devonian. (In: Devonian Deposits of the Volga-Ural Oil and Gas Bearing Region. A.I.Lyshenko and I.G.Gassanova, editors) | 1970 |