CGRG Bibliography of Canadian Geomorphology
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Author : Andrews, J.T. and Ives, J.D.
Date : 1972.
Title : Late- and postglacial events (less than 10,000 BP) in the eastern Canadian Arctic, with particular reference to the Cockburn moraines and break-up of the Laurentide Ice Sheet
Publication : In: Climatic Change in Arctic Areas During the Last 10,000 Years. edited by Y. Vasari; H. Hyvarinen; and S, HicksActa Universitalis Ouluensis, Series A, Scientiae Rerum Naturalium no. 3, Geologicam.
Issue : 1:
Page(s) : 149-174
Abstract
The Cockburn Moraines (morpho-stratigraphic term) of the Canadian Arctic are discussed in terms of their climatic implications at two leveis: the first is their place in the late- glacial chronology of eastern Baffin Island, N.W.T.; the second is their relationship on the regional scale to the final disintegration of the Laurentide Ice Sheet and the Cochrane readvance, south of James Bay. In eastern Baffin Island an analysis of 144 radiocarbon dates from coastal sites indicates a marked peak in the number of dates between 8,500 and 7,500 B.P. and a complete absence of any dates between 10,500 and 24,000 B.P. It is now certain that several areas on the outermost coast of eastern Baffin Island were not covered by late- Wisconsin fiord glaciers, so that the absence of 14C dates in this interval is unusual. In some fiords, dates of deglaciation obtained from marine shelis associated with local marine limits do not vary significantly from the fiord head to the mid-fiord areas and this suggests that in places the marine limits of ca. 8,000 B.P. were formed during an extensive transgression that is tentatively related to a readvance of the fiord glaciers during Cockburn time. In certain areas the Cockburn Moraines may even mark the greatest extent of late-Wisconsin ice. It is believed that the readvance is associated with increased precipitation during a general warming phase.
Bibliography of Canadian Geomorphology