Abstract

The writer studied fluvioglacial features in the central part of the Quebec-Labrador plateau between Snowy Lake and Knob Lake (54° 48' N., 66° 48' W.), near the western edge of the Proterozoic sedimentary province of the Labrador Trough.

Rapid dissipation of ice at the end of the Wisconsin glacial period resulted in the carving of many glacial drainage channels which are useful tools in clarifying the mode of deglaciation. The channels are genetically classified on the basis of morphology, disposition, and related deposition.

The rarity of fluvioglacial deposits at the surface, plus the strong evidence that the glacial drainage was predominantly subglacial, supports the view that during the deglaciation of this central tract the ice sheet had little motion, and masses of it became isolated in the wide valleys.

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