Open AccessSurficial geology, Knox Lake, Newfoundland and Labrador-Quebec, NTS 23-I northwest
Author(s) -
R C Paulen,
J M Rice,
HE Campbell,
M B McClenaghan
Publication year - 2019
Language(s) - English
Resource type - Reports
DOI - 10.4095/313547
Subject(s) - geology , deglaciation , drumlin , bedrock , ice sheet , seabed gouging by ice , glacial period , outcrop , landform , physical geography , geomorphology , ice stream , shelf ice , oceanography , cryosphere , geography , sea ice
The Knox Lake area is of moderate relief characterized by extensive till blankets in the lowlands, and till veneers and bedrock outcrops at higher elevations. The region was differentially eroded by the Laurentide Ice Sheet throughout Wisconsin time, largelyinfluenced by the migration of the Ancestral Labrador ice divide. Phases of radial ice flow from the migrating ice divide imparted discordant erosional ice-flow landforms and ice-flow indicators on the landscape. Terrain at higher elevations has been scoured by meltwaters from late-phase ablation ofthe ice sheet during deglaciation, which fed into an esker network trending from northwest to southeast across the map area. Extensive lowland fens, glaciolacustrine strandlines, and littoral sediments that surround isolated streamlined till units in the central portion of the map, mark the formernorthern extent of inundation of a large, shallow glacial lake (glacial Lake Low).