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TitleThe pattern and style of deglaciation at the Late Wisconsinan Laurentide and Cordilleran ice sheet limits in northeastern British Columbia
AuthorHuntley, D H; Hickin, A S; Lian, O B
SourceCanadian Journal of Earth Sciences 2016., https://doi.org/10.1139/cjes-2016-0066
Year2016
Alt SeriesEarth Sciences Sector, Contribution Series 20160234
PublisherNRC Research Press
Documentserial
Lang.English
Mediaon-line; digital
File formatpdf
ProvinceBritish Columbia; Yukon
NTS94N; 94O
AreaToad River; Maxhamish Lake
Lat/Long WENS-126.0000 -122.0000 60.0000 59.0000
Subjectslandforms; ice retreat; glacial landforms; glacial deposits; kames; moraines; Laurentide ice sheet; Cordilleran ice sheet; northern Rockies; southern Mackenzie Mountains
Illustrationslocation maps; satellite images; diagrams; photographs; graphs; tables
ProgramMackenzie Corridor Project Management, GEM2: Geo-mapping for Energy and Minerals
AbstractThis paper reports on the landform assemblages at the northern confluence of the Late Wisconsinan Laurentide and
Cordilleran ice sheets with montane and piedmont glaciers in the northern Rockies and southern Mackenzie Mountains. Recent
observations in northeastern British Columbia refine our knowledge of the pattern and style of ice sheet retreat, glacial lake
formation, and meltwater drainage. At the onset of deglaciation, confluent Laurentide and Cordilleran terminal ice margins lay
between 59°N, 124°30=W and 60°N, 125°15=W. From this terminal limit, ice sheets retreated into north-central British Columbia
and Yukon Territory, with remnant Cordilleran ice and montane glaciers confined to mountain valleys and the Liard Plateau.
Distinctive end moraines are not associated with the retreat of Cordilleran ice in these areas. Laurentide ice retreated northeastward
from uplands and the plateaus; then separated into lobes occupying the Fort Nelson and Petitot river valleys. Ice-retreat
landforms include recessional end moraines (sometimes overridden and drumlinized), hill-hole pairs, crevasse-fill deposits, De
Geer-like ribbed till ridges, hummocky moraines, kames, meltwater features, and glacial lake deposits that fall within the
elevation range of glacial Lake Liard and glacial Lake Fort Nelson (ca. 840-380 m). Meltwater and sediment transport into glacial
lakes Fort Nelson, Liard, Nahanni, and Mackenzie was sustained by remnant ice in the Liard River and Fort Nelson River drainage
basins until the end of glaciation. Optical dating of sand from stabilized parabolic dunes on the Liard Plateau indicates that
proglacial conditions, lake formation, and drainage began before 13.0 ± 0.5 ka (calendar years). The Petitot, Fort Nelson, and Liard
rivers all occupy spillways incised into glacial deposits and bedrock by meltwater overflow from glacial lakes Peace and Hay.
Summary(Plain Language Summary, not published)
This paper reports on the landforms in the northern Rockies and southern Mackenzie Mountains. Recent observations in northeastern British Columbia refine our knowledge of the pattern and style of ice sheet retreat, glacial lake formation, and meltwater drainage.
GEOSCAN ID299365