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The availability of well-preserved and documented Quaternary paleopedological archives decreases sharply to the north of the Eurasian Loess Belt, and the paleoecological reconstructions in these regions rely mostly on the records extracted from glacial, lacustrine, marine, and other sediments. The two pedosedimentary sequences that provide a detailed record of the last Interglacial-Glacial cycle are presented within the last periglacial area of the Russian Plain in the Upper Volga River basin. The studied paleosols within this area correspond to the warmer periods MIS3 and MIS5. The pedogenetic as well as plant and insect macrofossil proxies from the MIS5 paleosols are indicative of temperate forest ecosystems similar to the present ones. The MIS3 paleosols present the features of cryogenic processes as well as gleyic features, conditioned by permafrost. In agreement with this, the macrofossil record points to the cold tundra ecosystems that existed during the Middle Valdai interstadial in the region of present-day Taiga forests. Micromorphological analyses of the MIS3 paleosol profiles of the Upper Volga River basin allowed us to identify an assemblage of stable micromorphological features according to generally accepted guidelines. The MIS3 paleosols preserve pedogenetic episodes, including gleying, structural organization and cryogenic impact, humus, and peat accumulation. The MIS3 pedogenetic levels of the Upper Volga River basin are represented by soils with peat at the surface and/or mineral humus horizons underlain by compact gleyic horizons that indicate permanent waterlogging. The patterned ground and pedoturbation, together with the strong frost impact on the soil micromass, indicate the presence of permafrost. A set of cryogenic features in paleosols is regarded as cryotrassological indicators. The use of this indicator for the interpretation of past cryogenic settings has a promising future. According to the landscape studies, MIS 3 paleosols were former tundra and taiga permafrost soils. The palaeobotanical and palaeontological data are also indicative of the former tundra-steppe and forest-tundra ecosystems.

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Paleosols of Colluvial Pedosedimentary Sequences

  • 动态工具书词条

  • 发表日期：

    2026年

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  • Alexey Rusakov

摘要

The availability of well-preserved and documented Quaternary paleopedological archives decreases sharply to the north of the Eurasian Loess Belt, and the paleoecological reconstructions in these regions rely mostly on the records extracted from glacial, lacustrine, marine, and other sediments. The two pedosedimentary sequences that provide a detailed record of the last Interglacial-Glacial cycle are presented within the last periglacial area of the Russian Plain in the Upper Volga River basin. The studied paleosols within this area correspond to the warmer periods MIS3 and MIS5. The pedogenetic as well as plant and insect macrofossil proxies from the MIS5 paleosols are indicative of temperate forest ecosystems similar to the present ones. The MIS3 paleosols present the features of cryogenic processes as well as gleyic features, conditioned by permafrost. In agreement with this, the macrofossil record points to the cold tundra ecosystems that existed during the Middle Valdai interstadial in the region of present-day Taiga forests. Micromorphological analyses of the MIS3 paleosol profiles of the Upper Volga River basin allowed us to identify an assemblage of stable micromorphological features according to generally accepted guidelines. The MIS3 paleosols preserve pedogenetic episodes, including gleying, structural organization and cryogenic impact, humus, and peat accumulation. The MIS3 pedogenetic levels of the Upper Volga River basin are represented by soils with peat at the surface and/or mineral humus horizons underlain by compact gleyic horizons that indicate permanent waterlogging. The patterned ground and pedoturbation, together with the strong frost impact on the soil micromass, indicate the presence of permafrost. A set of cryogenic features in paleosols is regarded as cryotrassological indicators. The use of this indicator for the interpretation of past cryogenic settings has a promising future. According to the landscape studies, MIS 3 paleosols were former tundra and taiga permafrost soils. The palaeobotanical and palaeontological data are also indicative of the former tundra-steppe and forest-tundra ecosystems.