Pollen, plant macrofossil, loss-on-ignition and radiocarbon analyses of a 1.4-m section in thermokarst topography from Faddeyevskiy Island (75?20'N, 143?50'E, 30 m elevation) provides new information on Late Pleistocene interstadial environmental history of this high Arctic region. Conventional radiocarbon dates (25,700 ? 1000, 32,780 ? 500, 35,200 ? 650 yr BP) and two AMS dates (29,950 ? 660 and 42,990 ? 1280 yr BP) indicate that the deposits accumulated during the Kargian (Boutellier) interval.