Quaternary Geology in Part of the McLeod Lake Map-Area (NTS 093J), Central British Columbia.

摘要

The Quaternary geology in part of the McLeod Lake map-area was studied through the production and analysis of 1:50 000-scale terrain maps and the examination of stratigraphic exposures and landforms. The surficial geology is dominated by thick, streamlined till that thins where relief is high. Glaciofluvial outwash and ice-contact deposits occur throughout the area and extensive glaciolacustrine deposits blanket lowlying regions. The glacial stratigraphic record spans the Fraser Glaciation and is represented by a sequence of advance glaciolacustrine sediments, till and retreat glaciolacustrine and glaciofluvial sediments. Ice initially flowed into the study area from the northwest and retreated before the arrival of ice from the west and south. Ice-flow during the glacial maximum was northeast and transitioned to the east during deglaciation. Ground penetrating radar suggests that post-glacial aeolian activity was brief. Optical dating on K-feldspar from aeolian material suggests this activity occurred around 9.35 +/- 0.64, 9.94 +/- 0.77 and 13.3 +/- 1 ka and provides minimum ages for ice retreat.