Variations in δ¹⁸O, δ²H, and dexc in the samples of massive ice sampled on the left bank of the Erkutayaha River (southern part of Yamal) in July 2010 (point 10-YuV-Yerk).The isotopic composition of ice was determined at the Geographical Faculty of Moscow State University in the Laboratory of Stable Isotopes of the Department of Landscape Geochemistry and Soil Geography (Prof. Yu. Vasil'chuk, Dr. N. Budantseva, Dr. Ju. Chizhova) using the Delta V mass spectrometer with the GasBench standard option. During the measurements of δ¹⁸О, the analyzed samples were stabilized in CO2 for 24 hours; stabilization for the δ²H measurements was performed for 40 min in the presence of a platinum stabilizer. The International Standard of Mean Ocean Water (SMOW V), the MAGATE International laboratory standards, and the standards of the Isotope Laboratory of the Austrian Institute of Technology were used to calibrate the measurements.