Structure of Sediments of the Final Stage of the Kazantsevo Transgression (MIS 5) in the North of Western Siberia

摘要

The section of Kazanian marine sediments in the mouth of the Yenisei in the area of Ladygin Yar is studied with use of electron spin resonance analysis of shell remains of malacofauna and infrared optically stimulated luminescence analyses of grains of field spars. The results obtained fall within the interval from 77 000 to 71 000 years, which allows one to associate this strata with the final stage of the Kazanian transgression. Transgress sediments with vast boreal fauna of marine mollusks including representative species Arctica islandica accumulated during the MIS 5 period eliminate the possibility of existence of a glacial environment in the lower courses of the Yenisei and, moreover, the location of the region under the shield of ice sheet within this period.