14C dates of organic remains in ice wedges and enclosing sediments (central part of Seyakha yedoma exposure). Calibrated using OxCal 4.4 equipped with IntCal 20 (Reimer et al. 2020, doi:10.1017/RDC.2020.41). The isotope dates of water and ice samples were obtained at the isotope laboratory of the Department of Geography, Moscow State University, using a Delta-V mass spectrometer with a standard gas-bench option. For measurements we used the V-SMOW, GISP, and SLAP international standards, and the standards of the laboratory.