“…For instance, a number of geological studies have dealt specifically with the notion of an ice-free corridor (Catto and Mandryk, 1990;Jackson, 1979bJackson, , 1980bMathews, 1978b;Parris, 1975;Rutter, 1978Rutter, ,1980aRutter, b, 1982Stalker, 1970bStalker, , 1978Stalker, ,1980, and it is these studies which archaeologists have come to rely upon in their own work. Nonetheless, material well suited for dating is often preserved in prehistoric cultural deposits and can provide geologists with much needed chronologic data (e.g., Valentine et al, 1980). Several of the late Pleistocene dates listed in Table I, for instance, are derived from early archaeological sites in the Rockies and Foothills regions of Canada.…”