The Upper Marine Limit in the Little Whale River Area, New Quebec

Аннотация

The relatively high land in places near the east coast of Hudson Bay in this area enables a more accurate estimate of direction and tilt of the upper marine limit plane to be made and thus to throw light on the emergence of this area after the last glaciation. The lower limit of perched boulders was used to indicate the height of the marine limit, for they represent the limit of wave action, whereas evidence given by the highest marine shells was inconclusive. The method of altimeter measurements and instrumental errors are stated. Analysis of data from 21 sites shows that the upper marine limit plane is tilted up toward 232 degrees ± 36 degrees(toward Hudson Bay); data from two points in the Richmond Bay area gave a tilt up toward 227 degrees ± 24 degrees. The varied isostatic readjustment indicates a major center of ice dispersal in the southern Hudson Bay/northern James Bay region during the Wisconsin glaciation.