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. Analysing the genesis of Quaternary sediments is important for understandingthe glaciation history and development of marine sediments in the northernpart of Western Siberia. The problem is relevant since there is noconsistent concept of the Quaternary sediment genesis in the north ofWestern Siberia. The formation of sediments is associated with marine, glacial andinterglacial sedimentation conditions. The research objective is to identifythe persistent features characterising the conditions of sedimentation andrelief formation using the Nadym River basin as an example. The best methodfor studying this problem is a comprehensive analysis of the lithological,chronostratigraphic, petrographic and geomorphological studies of theQuaternary sediment upper strata. This study provides data from theanalysis of the basic characteristics of quartz grains at the site. Therounding and morphology of the quartz grains provide evidence of possibleglacial processing of some of the site strata. A petrographic study ofselected boulder samples was performed. Some of them, by the shape andpresence of striation, can be attributed to ice basins. The first use of adetailed digital elevation model applied to the study area made it possibleto identify specific relief forms that could very likely be created duringglaciations. Based on the analysis, we propose to consider the vastlake alluvial plains in the Nadym River basin as periglacial regions. Thisidea lays the lithological framework for understanding the reasons for theformation of the modern landscape structure. The materials and descriptionsprovided are of interest to researchers of Quaternary sediments, topography,vegetation and soil cover, particularly researchers engaged in revising thehistory of the natural environment development in the north of WesternSiberia.

Lithological and geomorphological indicators of glacial genesis in the upper Quaternary strata, Nadym River basin, Western Siberia