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Lithostratigraphic and geochronologic data from Yukon Territory indicate relatively limited glaciation in the northern Canadian Cordillera during the early Wisconsinan. If the Cordilleran Ice Sheet existed in south and central Yukon during the early Wisconsinan, it was less extensive than during either the Illinoian or late Wisconsinan. In contrast, ice cover during the early Wisconsinan in British Columbia and northern Washington may have been comparable to that of the late Wisconsinan, as suggested by the widespread occurrence of glacial deposits between middle Wisconsinan and presumed Sangamonian nonglacial strata.

Sediments of probable Sangamonian age have been studied for pollen and plant...

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