CGRG Bibliography of Canadian Geomorphology
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Author : England, J.; Bradley, R.S.; and Struckenrath, R.
Date : 1981
Title : Multiple glaciations and marine transgressions, western Kennedy Channel, Northwest Territories, Canada
Publication : Boreas
Issue : 10(1):
Page(s) : 71-89
Abstract
Late Wisconsin/Wuerm glacial deposits were not observed in the lower valleys bordering Kennedy Channel. The outermost Ellesmere Island ice advance (Zone II) is radiometrically bracketed by super(14)C dates on in situ shells from subtill and supratill marine units which are 40,350 plus or minus 750 and > 39,000 B.P., respectively. Amino acid age estimates on the same shell samples and others from similar stratigraphic positions all suggest ages of > 35,000 B.P. Stratigraphically and chronologically this ice advance is correlated with the outermost Ellesmere Island ice advance 20-40 km to the north which formed small ice shelves when the relative sea level was ca. 175 m above sea level. The Holocene marine transgression along western Kennedy Channel occurred in an ice-free corridor maintained between the separated margins of the northwest Greenland and northeast Ellesmere Island ice sheets during the last glaciation. Initial emergence may have begun ca.12,300 B.P., however, sea level had dropped only 15 m by ca. 8000 B.P. after which glacio-isostatic unloading of the corridor was rapid. The implications of these data are discussed in the context of existing models on high latitude glaciation and paleoclimatic change
Bibliography of Canadian Geomorphology