This paper presents new field and laboratory data combined with previously published materials on interglacial sediments underlying two upper tills of northern European Russia and West Siberia. The emphasis is on the structure and chronometric data of marine strata with shells of boreal molluscs of Cyrtodaria genus indicative of the Atlantic marine invasion into these sedimentary basins during the late Middle Pleistocene. Another line of evidence for this time span is inferred from inter-till terrestrial sequences in the European Northeast with forest pollen spectra suggesting a climate much warmer than today. The decisive correlation signal is provided by optically stimulated luminescence and electron-spin resonance dates, indicating MIS 7 time, and by the geological position of two interglacial formations between the first, second and third from the surface glacial complexes. The collected evidence disagrees with the model of the unique boreal transgression and confirms that saline Atlantic water at least twice invaded northern Russia during the last 250 kyears. The sedimentary formations of the penultimate interglaciation can serve as a new intra-regional stratigraphic marker for the northern Pleistocene.

本文介绍了新的实地和实验室数据，并结合先前发表的关于俄罗斯北部和西西伯利亚两个上层耕地下方的间冰期沉积物的材料。重点是海带的结构和年代学数据，其中包括Cyrtodaria的北方软体动物的贝壳表明在中更新世晚期大西洋海洋入侵这些沉积盆地的属。这个时间跨度的另一条证据是从欧洲东北部的耕地间断层序列推断出来的，森林花粉光谱表明气候比今天温暖得多。决定性的相关信号是由光学受激发光和电子自旋共振日期提供的，表明 MIS 7 时间，以及来自表面冰川复合体的第一个、第二个和第三个之间的两个间冰期地层的地质位置。收集到的证据与独特的北方海侵模型不一致，并证实大西洋咸水在过去 250 公里内至少两次入侵俄罗斯北部。