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.

中文翻译：

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白俄罗斯东欧地台奥尔沙坳陷文迪安矿床微化石分布

摘要-

在白俄罗斯的钻孔中打开了东欧地台下文迪安和上文迪安的完整剖面。这使我们可以将该区域视为一个层型区域。为了更新 Vendian 的古生物学特征，研究了在奥尔沙凹陷北部钻探的 Bogushevsk-1、Bogushevsk-2 (Liozno) 和 Lepel-1 参考钻孔的有机壁微化石。在 Volyn 系列的下 Vendian Liozno 组和上 Vendian Kotlin 组中发现了具有 Leiosphaeridia minutissima-Leiosphaeridia tenuissima 的及物组合 I。Redkino 微化石组合在 Nizy、Selyava 和 Chernitsa 组的三个地层水平上被确定：组合 II 与 Morania zinkovi，组合 III 与 Morania zinkovi-Tynnia precambrica，Morania zinkovi-Tynnia precambrica-Striatella coriacea，分别。Kotlin 组合 V 与 Vendotaenia antiqua-Primoflagella speciosa 在 Kotlin 组的上部（Bogushevsk-1 钻孔）的上部很明显。根据分类组成，组合 III 和 IV 与 Starorusskaya 组的第一个 Redkino 生物群相关；组合 V 与俄罗斯西北部 Vasileostrovskaya 组的第三个 Kotlin 生物群相关。我们的数据显示有机壁微化石具有很高的生物地层潜力，应用于在东欧平台更新的地层方案中证实上文迪安的区域地层单元。