Type and reference sections of the Permian–Triassic continental sequences of the East European Platform: main isotope, magnetic and biotic events / Типовые и эталонные разрезы пермско-триасовых континентальных последовательностей Восточно-Европейской пл.

The best section of the Permian continental sequence of the Russian Platform is located in the Sukhona and Malaya Severnaya Dvina Rivers Basin, Vologda Region. This territory is situated in the north-eastern part of the Moscow Basin (Syncline), on the Sukhona Swell (Fig. 1). It is a tectonically active area (uplift). As a result, the Sukhona River is actively cutting into the bedrock and forming high beauty outcrops (up to 60 m) for a distance of 100 km. The outcrops stretch along the river banks for many kilometers (Fig. 2) and allow tracing of the marker beds for a long distance and level-by-level correlation of many sections. Monocline bedding layers make it possible to see a stratigraphically continuous succession of continental deposits from the upper Urzhumian of the Biarmian Series to the Vokhmian of the Lower Triassic, i.e., from the upper Wordian to the Induan (Figs. 3, 4). These deposits were formed in different facial zones in conditions of semiarid-subhumid climate and are rich in fossils of algae, higher plants, ostracods, conchostracans, insects, bivalves, gastropods, fishes, and tetrapods. They have been repeatedly described in detail, and stratified into a number of regional and local units (Amalitzky, 1897; Edemsky, 1928; Lutkevich, 1931, 1938, 1939, 1955; Mazarovich, 1946; Ignatiev, 1962; Pakhtusova, 1966; Strok and Buslovich, 1979; Reference Section…, 1981; Upper Permian…, 1984; Verzilin et al., 1993; Golubev, 1998, 2000; Tatarian beds…, 2001). <...>

Стратотипы и опорные разрезы континентальных перми и триаса Восточно-Европейской платформы: ключевые изотопно-геохимические, палеомагнитные и биотические события