The Batagay megaslump is the largest one on the Earth and located close to the Batagay settlement on the right bank of the Yana River in Yakutia, eastern Siberia. Radiocarbon data were obtained to verify the formation time of ice wedges in the Upper Ice Complex of the Batagay yedoma. Furthermore, a cryostratigraphic description and the detailed vertical distribution of the δ18O, δ2 H, and dexc values of the three studied ice wedges is provided. The 14С dates obtained from the ice wedges allowed to date the formation time of studied ice wedges in the Upper Ice Complex from 47.9 to 27.2 cal ka BP. Based on the stable isotope record (171 samples), the average January temperature during the Late Pleistocene was consistently low at -51ºС for both periods from 30.800 to 27.100 cal BP - Marine Isotope Stage (MIS 2) and from 47,900-44,700 cal BP (MIS 3) in the Verkhoyansk district of Yakutia.

Data was submitted and proofread by Yurij K Vasil'chuk and Lyubov Bludushkina at the faculty of Geography, department of Geochemistry of Landscapes and Geography of Soils, Lomonosov Moscow State University.