CGRG Bibliography of Canadian Geomorphology
Search Results
Author : Berger, G.W.; and Nielsen, E
Date : 1991
Title : Evidence from thermoluminescence dating for Middle Wisconsinan deglaciation of the Hudson Bay Lowland of Manitoba
Publication : Canadian Journal of Earth Sciences.
Issue : 28(2):
Page(s) : 240-249
Abstract
We report here the first direct dating of the nonglacial, intertill Nelson River sediments from five sites in northern Manitoba. We used the thermoluminescence (TL) sediment-dating technique to obtain age estimates of 32-46 ka for four samples and 119 ka for the fifth, all samples previously correlated to the Sangamonian Stage (80-130 ka) Missinaibi Formation. We interpret the younger TL dates as being within 20-40% of the true deposition ages, but interpret the oldest TL date as an overestimate because of ineffective zeroing of the light- sensitive TL associated with observed pebble and sand detritus in that sample. Thus these younger direct dates imply a significant climatic warming and deglaciation in the heart of the Laurentide Ice Sheet area during Middle Wisconsinan time.
Bibliography of Canadian Geomorphology