This data set is part of a larger data harmonization effort to make lake sediment core data machine readable and comparable. Here we standardized grain size element data of sediment core PG1975-1, retrieved in 2009 from Lake Elgene-Kyuele (lower Lena River, Yakutia, Russia) at 4.8 m water depth. The thermokarst lake Elgene-Kyuele is situated in the forest tundra and has several small outflows and one visible inflow. It lies at an elevation of ca. 147 m a.s.l. with a surface area of ca. 1.34 km2 and a maximum lake water depth of estimated 10.5 m. The 1.26 m sediment core was retrieved by a UWITEC hammer action gravity corer during the RU-Land_2009_Lena-transect expedition of the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (AWI, Germany, Potsdam) in cooperation with the North Eastern Federal State University (NEFU, Russia, Yakutsk). Grain-size was measured by COULTER LS 200 Laser Diffraction Particle Analyser at AWI Potsdam.