CGRG Bibliography of Canadian Geomorphology
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Author : Gray, J.T.; Boutray, B.; Hillaire-Marcel, C.; and Lauriol, B.
Date : 1980
Title : Postglacial emergence of the west coast of Ungava Bay, Quebec
Publication : Arctic and Alpine Research
Issue : 12(1):
Page(s) : 19-30
Abstract
Field studies have provided a sufficient spread of radiocarbon-dated sea levels to enable presentation of a general history of postglacial emergence for a 300-km stretch of the west coast of Ungava Bay. In the late Wisconsin glacial stage, this coastal area was covered by continental ice moving in a generally northeasterly directly. The deglaciation of the coast took place 7500 to 7000 yr BP, the retreat of the ice front to the west and southwest being accompanied by a marine submergence which left well-drained marine limits throughout the region. The metachronous nature of the marine limit does not permit the construction of isobases or of precise tilt directions during subsequent isostatic readjustment, but isolines on the marine limit clearly imply a steady increase in elevation from 120 m a.s.l. at Diana Bay in the north, to 180 m a.s.l. at Leaf Bay and Fort Chimo. Subsequent land emergence due to isostatic readjustment is represented by two curves based on 24 radiocarbon dates at elevations varying from close to the marine limit down to 9 m above present sea level. Although the emergence can be represented reasonably well by continuous and decelerating curves, relatively temporary phases of sea-level stability are indicated by morphological evidence such as old marine deltas, bar and lagoon complexes, boulder barricades, raised beaches, and erosional bluffs.
Bibliography of Canadian Geomorphology