ABSTRACT: Une novelle courbe du niveau marin relatif pour la region de Rivere-du-Loup (Quebec). [A new sea-level curve for the Rivere-du-Loup area (Quebec).

CGRG Bibliography of Canadian Geomorphology
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Abstract

Following the Wisconsinan deglaciation, the coastal area at Rivere-du-Loup was submerged by the Goldthwait Sea. The maximum level reached is approximately 145 m, the highest fossiliferous beaches, however, being at 135 m. The isostatic land recovery has been rapid during the last three millennia reaching approximately 90%. Between 7 and 6 ka, a low stand, at least 5 m below the present level, took place, and was followed by a second transgression between 6 and 4 ka. From 4 ka to present day, land emergence prevailed, although it is also likely that minor fluctuations (1-2 m) occurred, particularly during the Mitis stage dated circa 2 ka. The recent tide gauge data for the Rivere-du-Loup area do not permit to determine the present trend of the relative sea level. However, the rapid cut back of the edge of the tidal marsh at a mean annual rate of 3 m suggests a rising sea level. The numerous 14C dates available allowed the presentation of a new sea-level curve showing the main geologic events that occurred in the Rivere-du-Loup area during the Holocene.

Bibliography of Canadian Geomorphology