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Loess-soil formations within the Pleistocene periglacial zone are widely spread. Most researchers believe that cyclical climate variations in the Pleistocene are fixed in the structure of loess-soil formations. A cryolithological analysis of mineral matter was conducted to assess the paleogeographic conditions of their formation. It is shown that processes of cryogenic transformation of deposits took place in the conditions of seasonal freezing in the Pleistocene, which contributed to the formation of the high thickness loess. This study has been supported by RFBR (Grant №18-35-00619).