CGRG Bibliography of Canadian Geomorphology
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Author : Elson, J.A.
Date : 1969.
Title : Late Quaternary marine submergence of Quebec
Publication : Revue de géographie de Montreal
Issue : 23:
Page(s) : 247-250.
Abstract
About 220,000 km2 Of Quebec was submerged mainly during the deglaciation of the last 13,000 years. This resulted from slow isostatic uplift of the crust concurrent with eustatic rise of sea level. The earliest submergence was in the Gulf and the St. Lawrence estuary from about 13,000 to 10,000 years ago. The Champlain Sea occupied the upper St. Lawrence and Ottawa valleys from about 12,000 to 10,000 years ago and was succeeded by the smaller Lampsilis Lake which was drained prior to 7,000 years ago. The Lake St. John area was flooded by the Laflamme Sea from about 10,300 to 8,700 years ago. Marine submergence of valleys and narrow parts of the coast in the Ungava Bay regions occurred from 8,000 to 6,000 years ago. The coast of Hudson and James bays was extensively inundated from about 7,000 to 3,000 years ago. Crustal uplifts ranging from 150 to 275 m have occurred since deglaciation, generally at rates of from 5 to 10 m per century for the first 2,000 to 4,000 years. Eustatic rise of sea level exceeded the rate of uplift roughly 10,800 years ago, sometime between 6,000 to 8,000 years ago, and about 5,000 years ago, resulting in local temporary regression and transgression of the sea. Fossils reflect conditions of salinity and temperature in the submerged areas.
Bibliography of Canadian Geomorphology