A late-glacial and postglacial chronology on Adak Island in the Aleutian chain is represented by a series of three wind-blown sands, each terminated by a soil zone, and all three overlying a slightly weathered late-glacial till and marine terrace. Evidence of human occupation is present in the soil zones of the two upper sands. The younger culture is recent Aleut, the older is unidentified. It is suspected that the chronology results from variations in climate obtaining over a large portion of the North Pacific.