CGRG Bibliography of Canadian Geomorphology
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Author : Andrews, J.T.; Szabo, B.J.; and Isherwood, W.
Date : 1975
Title : Multiple tills radiometric ages and assessment of the Wisconsin glaciation in Eastern Baffin Island, NWT
Publication : Arctic and Alpine Research
Issue : 7(1):
Page(s) : 39-59
Abstract
Between Narpaing and Quajon fiords, wave-cut cliffs expose three glacial and three marine units. An upper till, Kivituiba'k Till, overlies marine unit 3 with shells that have a 230Th and 231Pa date of 137,000 ± 12,000 years and a 230Th date of 100,400 ± 6,400 years. The marine unit 3 outcrops at 15 m above present sea level (a.s.l.) and is marked by an impoverished fauna with very thick shells, indicating that the marine sediments were deposited during the onset of glaciation as the ice load isostatically depressed the crust. The middle till, the Narpaing Till, overlies the marine unit 2. Marine unit 2 contains a wider diversity of thinner shell species and it outcrops 10 m a.s.l. No radiometric date is yet available on the marine unit 2. The Kangeek Point Till is the lower and oldest till; it was deposited during a considerably more extensive glaciation and overlies marine unit 1. A review of other published dates > 20,000 BP (42 in total) and the stratigraphic setting suggest that the local glacial chronology of the Narpaing/Broughton Island area has general applicability elsewhere along the 1,200-km northeastern margin of the Laurentide ice sheet, at least as a model for further testing and refinement.
Bibliography of Canadian Geomorphology