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The glacial lake Kucherla is located in the Altai Mountains at an altitude of 1790 meters above sea level. We use the 112 cm core obtained in March 2018 from the deepest part of the lake (45 m) for the study. In the process of coring, special attention was paid to the preservation of the upper layers of the bottom sediment (water - sediment boundary). Bottom sediments of the lake contain visual layers with a thickness of 1-3 mm. We count the layers using photographs of the optical sections. Counting the layers and...