Among numerous localities of Late Proterozoic (Vendian) fossilized soft-bodied organisms, the southeastern White Sea region is the most informative one owing primarily to high taxonomic diversity of the biota and perfect preservation of its remains. The absence of paleontologically characterized Vendian‐ Cambrian boundary sections, a drawback of this region, hampers the correlation and restricts possibilities of paleontological studies. Based on lithological correlation between sections of the southeastern White Sea region and northwestern East European Platform, the existence of Cambrian sediments in the northeastern White Sea region was repeatedly suggested in the 1950s and 1960s [1‐4]. However, this assumption could not be confirmed because of the poor geological knowledge of sediments attributed now to the Padun Formation that crowns the Valdai Group section in the southeastern White Sea region. Recently, we were able to solve this problem. In the Padun Formation, we detected trace fossils Diplocraterion , which indicate the Cambrian age of host sediments and allowed us to carry out a more reliable correlation of Vendian reference sections of the White Sea region with coeval sequences not only in the neighboring regions, but also beyond the East European Platform. In 2004, we studied small isolated outcrops of redbrown and light gray fine-grained quartz sandstones partly bleached by surface weathering in the Bol’shaya Yura River, a right tributary of the Severnaya Dvina River (Fig. 1). The sections include numerous sandstone layers with thin horizontal lamination (Fig. 2) that form lenticular interbeds from 4‐8 cm to 0.5 m thick. The thin lamination pattern is provided by alternation of millimeter-scale sandstone laminae that differ in grain-size and the shape of detrital material. Some interbeds are characterized by convolute lamination, probably related to water-saturation and deformation of finely laminated sediments. The sections enclose abun