Abstract
—The complete sections of the Lower and Upper Vendian of the East European Platform were opened in the boreholes of Belarus. This allows us to consider this region as a stratotype area. In order to update the paleontological characteristics of the Vendian, organic-walled microfossils from the Bogushevsk-1, Bogushevsk-2 (Liozno), and Lepel-1 reference boreholes drilled in the north of the Orsha Depression were studied. The transitive assemblage I with Leiosphaeridia minutissima–Leiosphaeridia tenuissima was recognized in the Lower Vendian Liozno Formation of the Volyn Series and the Upper Vendian Kotlin Formation. The Redkino microfossil assemblages were identified at three stratigraphic levels in the Nizy, Selyava, and Chernitsa formations: assemblage II with Morania zinkovi, assemblage III with Morania zinkovi–Tynnia precambrica, and assemblage IV with Morania zinkovi–Tynnia precambrica–Striatella coriacea, respectively. The Kotlin assemblage V with Vendotaenia antiqua–Primoflagella speciosa was distinguished in the upper part of the Kotlin Formation (Bogushevsk-1 borehole). On the basis of the taxonomic composition, assemblages III and IV are correlated with the first Redkino biota of the Starorusskaya Formation; assemblage V is correlated with the third Kotlin biota of the Vasileostrovskaya Formation of the northwestern part of Russia. Our data show a high biostratigraphic potential of organic-walled microfossils, which should be used to substantiate regional stratigraphic units of the Upper Vendian in the updated stratigraphic scheme of the East European Platform.
Highlights
The Vendian deposits were studied most actively in the 1960s–1980s (Fedonkin, 1981; Rifei..., 1976; Sokolov, 1974, 1980; Vendskaya..., 1985а, 1985b; Volkova et al, 1979)
Our studies made it possible to update the paleontological characteristics of the Vendian deposits of the Orsha Depression of the European Platform (EEP)
Terrigenous strata of the Nizy, Selyavy, and Chernitsa formations contain the second, the third, and the fourth Redkino assemblages, respectively. They contain abundant specific microorganisms Morania zinkovi, which are unknown in northwestern Russia but are found in the Podolia sections (Gnilovskaya et al, 1988; Golubkova et al, 2018)
Summary
The Vendian deposits were studied most actively in the 1960s–1980s (Fedonkin, 1981; Rifei..., 1976; Sokolov, 1974, 1980; Vendskaya..., 1985а, 1985b; Volkova et al, 1979). Regional stratigraphic charts (RSC) of the Vendian adopted for Belarus (Geologiya..., 2001; Makhnach et al, 2005а; Stratigraficheskie..., 2010) and European Russia (Postanovleniya..., 1992; Semikhatov et al, 1991; Stratigraficheskaya..., 1996) largely coincide in terms of the principles of recognition, volume, and paleontological content (Fig. 1). During the breakup of the Rodinia supercontinent at the Late Baikalian stage, a large Volyn-Brest Magmatic Province was formed in the southwest of Russia (Makhnach and Veretennikov, 1970, 2001; Nosova et al, 2008; Rifei..., 1976) This stage was characterized by the accumulation of Riphean terrigenous strata, which were isolated in the Sherovichi and Belorussian series (Rifei..., 1976; Stratigraficheskie..., 2010). The first three formations (Nizy, Selyavy, and Chernitsa) are attributed to the Redkino Regional Stage, and the fourth one (Kotlin Formation) is attributed to the Kotlin Regional Stage (Makhnach and Veretennikov, 2001; Stratigraficheskie..., 2010)
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