The Vermilion Lakes site in Banff National Park, Alberta, has yielded cultural remains suggesting a possible sheep-hunting focus during the Paleoindian period and providing evidence for windbreaks or shelters dating as early as 10,300 B.P. Debris flows at this site have separated and preserved six or more cultural components dating between the mid-eleventh and mid-tenth millennia before present. Paleoenvironmental evidence suggests that most of these components date to a period of severe climate. Accelerator and conventional carbon dating of these strata suggest that, for at least part of this time, the detail of the temporal sequence is beyond the resolution of these techniques. Apparent 14C inversions can best be explained by 14C plateaus during key periods of the site's occupation.