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TitleAn updated radiocarbon-based ice margin chronology for the last deglaciation of the North American Ice Sheet Complex
AuthorDalton, A S; Margold, M; Stokes, C R; Tarasov, L; Dyke, A S; Adams, R S; Allard, S; Arends, H E; Atkinson, N; Attig, J W; Barnett, P J; Barnett, R L; Batterson, M; Bernatchez, P; Borns, H W, Jr; Breckenridge, A; Briner, J P; Brouard, EORCID logo; Campbell, J E; Carlson, A E; Clague, J J; Curry, B B; Daigneault, R A; Dubé-Loubert, H; Easterbrook, D J; Franzi, D A; Friedrich, H G; Funder, S; Gauthier, M S; Gowan, A S; Harris, K L; Hétu, B; Hooyer, T S; Jennings, C E; Johnson, M D; Kehew, A E; Kelley, S E; Kerr, D; King, E L; Kjeldsen, K K; Knaeble, A R; Lajeunesse, P; Lakeman, T R; Lamothe, M; Larson, P; Lavoie, M; Loope, H M; Lowell, T V; Lusardi, B A; Manz, L; McMartin, IORCID
logo; Nixon, C; Occhietti, S; Parkhill, M A; Piper, D J WORCID logo; Pronk, A G; Richard, P J H; Ridge, J C; Ross, MORCID logo; Roy, M; Seaman, A; Shaw, J; Stea, R R; Teller, J T; Thompson, W B; Thorleifson, L H; Utting, D J; Veillette, J JORCID logo; Ward, B C; Weddle, T K; Wright, H E, Jr
SourceQuaternary Science Reviews vol. 234, 106223, 2020 p. 1-27, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20190312
Mediapaper; on-line; digital
RelatedThis publication is related to the following publications
File formatpdf; html; xlsx (Microsoft® Excel®); shp
ProvinceCanada; British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut; Eastern offshore region; Northern offshore region; Western offshore region; Canada
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
AreaNorth America; Canada; United States of America
Lat/Long WENS-179.0000 -42.0000 85.0000 38.0000
Subjectssurficial geology/geomorphology; geochronology; Nature and Environment; Science and Technology; glacial history; Wisconsinian glacial stage; deglaciation; ice sheets; ice margins; ice retreat; radiometric dating; radiocarbon dating; continental margins; continental shelf; glacial lakes; North American Ice Sheet Complex; Laurentide Ice Sheet; Cordilleran Ice Sheet; Innuitian Ice Sheet; Last Glacial Maximum; Iceland Ice Sheet; Greenland Ice Sheet; Labrador Dome; Des Moines Lobe; Phanerozoic; Cenozoic; Quaternary
Illustrationslocation maps; histograms; tables; geoscientific sketch maps
ProgramGEM2: Geo-mapping for Energy and Minerals GEM Synthesis
Released2020 03 09
AbstractThe North American Ice Sheet Complex (NAISC; consisting of the Laurentide, Cordilleran and Innuitian ice sheets) was the largest ice mass to repeatedly grow and decay in the Northern Hemisphere during the Quaternary. Understanding its pattern of retreat following the Last Glacial Maximum is critical for studying many facets of the Late Quaternary, including ice sheet behaviour, the evolution of Holocene landscapes, sea level, atmospheric circulation, and the peopling of the Americas. Currently, the most up-to-date and authoritative margin chronology for the entire ice sheet complex is featured in two publications (Geological Survey of Canada Open File 1574 [Dyke et al., 2003]; 'Quaternary Glaciations - Extent and Chronology, Part II' [Dyke, 2004]). These often-cited datasets track ice margin recession in 36 time slices spanning 18 ka to 1 ka (all ages in uncalibrated radiocarbon years) using a combination of geomorphology, stratigraphy and radiocarbon dating. However, by virtue of being over 15 years old, the ice margin chronology requires updating to reflect new work and important revisions. This paper updates the aforementioned 36 ice margin maps to reflect new data from regional studies. We also update the original radiocarbon dataset from the 2003/2004 papers with 1541 new ages to reflect work up to and including 2018. A major revision is made to the 18 ka ice margin, where Banks and Eglinton islands (once considered to be glacial refugia) are now shown to be fully glaciated. Our updated 18 ka ice sheet increased in areal extent from 17.81 to 18.37 million km2, which is an increase of 3.1% in spatial coverage of the NAISC at that time. Elsewhere, we also summarize, region-by-region, significant changes to the deglaciation sequence. This paper integrates new information provided by regional experts and radiocarbon data into the deglaciation sequence while maintaining consistency with the original ice margin positions of Dyke et al. (2003) and Dyke (2004) where new information is lacking; this is a pragmatic solution to satisfy the needs of a Quaternary research community that requires up-to-date knowledge of the pattern of ice margin recession of what was once the world's largest ice mass. The 36 updated isochrones are available in PDF and shapefile format, together with a spreadsheet of the expanded radiocarbon dataset (n = 5195 ages) and estimates of uncertainty for each interval.
Summary(Plain Language Summary, not published)
Understanding the pattern of past ice sheet retreat following the Last Glacial Maximum is critical for studying many facets of the past 20 000 years, including ice sheet behaviour, the evolution of landscapes, sea level, and atmospheric modelling. To fulfil this need, university and government researchers from Canada, the United States and Europe have collected information gathered over the last 15 years to present and discuss a series of 36 maps that describe the most recent knowledge on the pattern of deglaciation of the North American Ice Sheet. Seventy authors contributed to this publication, including five authors from the Geological Survey of Canada who synthesized new information largely collected as part of recent GEM projects in Northern Canada.

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