The genesis and spatial differentiation of the silty sands and loams deposited during the Late Valdai glaciation have been studied in the central part of the Russian Plain within the Mologa-Sheksna Lowland and on terraced slopes of the Ovinishchensk Upland (Yaroslavl oblast). The stratigraphy of these sediments on different elements of the local topography and data on their particle-size distribution suggest that they belong to the same paragenetic group. Some differences in the particle-size distribution can be explained by the specificity of sedimentation in periglacial lakes found at different geomorphic levels (from 102 to 180 m a.s.l.) during the Ostashkov phase of the Valdai glaciation. For the first time, statistically significant differences in the properties of Holocene soils developed at different hypsometric levels have been revealed. The degree of textural differentiation of the soils developed from silty loams increases with an increase in the absolute height of the surface. The analysis of factu