Paleontological Characteristics of the Upper Vendian–Lower Cambrian Sediments in the Section of the North Polotsk Borehole of the East European Platform, Belarus
E. Yu. Golubkova, O. F. Kuzmenkova, A. G. Laptsevich, E. A. Kushim, T. V. Vaskaboinikava, M O Silivanov
Abstract
In boreholes of the central regions of the East European Platform, continuous terrigenous sequences of the Vendian–Lower Cambrian are exposed, which makes it possible to consider them as reference for the development of a unified regional stratigraphic scheme for Belarus and the European Russia. This article presents the results of a paleontological and lithological study of a parametric borehole North Polotsk, drilled in the north of Belarus (Latvian saddle). An analysis of the taxonomic diversity of fossil organisms made it possible to identify six associations: association I with Striatella coriacea–Zinkovioides inclusus of the Redkino age; association II with Leiosphaeridia minutissima–Leiosphaeridia tenuissima, association III with Aataenia reticularis–Vendotaenia antiqua–Primoflagella speciosa, and association IV with Aataenia reticularis–Bicuspidata fusiformis of the Kotlin age; association V with Teophipolia lacerate–Gen. et sp. indet. 4 of the Rovno–Lontova age; and association VI with Granomarginata squamacea–Cochleatina ignalinica–Platysolenites antiquissimus of the Lontova age. The Precambrian–Cambrian boundary is drawn at the base of the Rudamina Formation. The data obtained significantly complement the paleontological characterization of the Vendian–Cambrian transitional deposits, which can be used in stratigraphic and paleofacies constructions.