Abstract: The content of carbon and nitrogen, as well as the carbon-to-nitrogen ratio in the genetic horizons of the soil cover, yedoma deposits and in organic residues in syngenetic ice wedges (IW) of the upper IW complex of the Batagay megaslump were studied. The studied soils belong to the silty-loam Spodic Cryosol (Dystric,Humic) and post-pyrogenic Spodic Cryosol (Dystric,Humic). To study the carbon and nitrogen content, ice wedges of the first and second tiers of the upper IW complex
were tested. The highest values of the C/N ratio were obtained in the upper horizon of the silty-
loam Spodic Cryosol (Dystric, Humic) near the Batagay megaslump. The average value of
the carbon content in the ice wedges of the Batagay yedoma is of 0.13 mol, the maximum is 0.36
mol, the minimum carbon content is 0.06 mol, the average nitrogen content is of 0.04 mol, maximum 0.12 mol, minimum 0.02 mol. For the entire data array of ice wedges, the
value of C/N is of average 3.90, maximum 6.96, minimum 1.05.