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This article is dedicates to the assessment of the contribution of Professor Vasilchuk to the development of isotopic geocryology, as well as testing the reliability of paleogeocryological reconstructions based on the study of isotopic composition of polygonal ice wedges.&amp;nbsp;His discovery of direct dependence of isotopic composition of the sprouts of modern ice wedges on the temperature characteristics of the winter season of 1989 marked the beginning of a promising research of the Holocene and Late Pleistocene syngenetic ice wedges as a reliable paleoclimatic archive.&amp;nbsp;He was first to obtain the characteristics of the winter period&amp;nbsp;for the late Pleistocene and Holocene, as well as create the maps for distributing paleotemperatures for the key periods of Late Pleistocene.&amp;nbsp;The data on the isotopic composition of ice wedges acquired by other scholars later fit into the distribution of paleotemperature within the cryolithozone reconstructed by Professor Vasilchuk.&amp;nbsp;For establishing the degree of reliability of paleotemperature reconstructions, the authors tested the ratio proposed by Y. K. Vasilchuk and regression equations from the works of Konyakhin, Mayer, and Oblogov.&amp;nbsp;The acquired results demonstrate that the values of winter-average and January-average temperatures in reconstruction by Vasilchuk&amp;rsquo;s ratio always fall within the reliability interval in the entire modern temperature range.&amp;nbsp;Testing the current temperature using regression equations often determine a considerable deviation (often within 3-4&amp;deg;C) from the actual values of winter-average and January-average temperatures.	

On the reliability of the Vasilchuk’s paleotemperature-isotopiv equations and the establishment of isotopic paleogeocryology