Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Evidence for early Pleistocene glaciation from borecore stratigraphy in north-central Alberta, Canada

Laurence D. Andriashek and Rene W. Barendregt
Evidence for early Pleistocene glaciation from borecore stratigraphy in north-central Alberta, Canada
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (April 2017) 54 (4): 445-460

Abstract

Pleistocene sediments collected in north-central Alberta, Canada, were subsampled and studied for paleomagnetic remanence characteristics. A magnetostratigraphy has been established for sediments previously assumed to represent multiple continental (Laurentide) glaciations but for which no geochronology was available. Based on the Quaternary record elsewhere in Alberta and Saskatchewan, it was thought that some of these sediments were deposited during pre-late Wisconsinan glaciations. The Quaternary sedimentary successions of north-central Alberta have a thickness up to 300 m within buried valleys and are composed of diamicts interbedded with glaciolacustrine and outwash sediments. Most of the sampled units are not accessible from outcrop, and their sedimentology and stratigraphy is derived from core data only. In 4 of 16 borecores sampled to date, diamict that correlates with the Bronson Lake Formation till is reversely magnetized, indicating an Early Pleistocene age. This formation is underlain by either Empress Formation sediments or Colorado Group shale, and is overlain by one or more normally magnetized glacigenic sedimentary units of the Bonnyville, Marie Creek, and Grand Centre formations, respectively. This new record of Early Pleistocene glaciation in north-central Alberta places the westernmost extent of earliest Laurentide ice at least 300 km farther west than its previously established limit in the Saskatoon and Regina regions of the Canadian Interior Plains, but still to the east of the maximum extent of the Late Wisconsinan (Late Pleistocene) Laurentide Ice Sheet, which extended into the foothills of the Alberta and Montana Rocky Mountains.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 54
Serial Issue: 4
Title: Evidence for early Pleistocene glaciation from borecore stratigraphy in north-central Alberta, Canada
Affiliation: Alberta Geological Survey, Edmonton, AB, Canada
Pages: 445-460
Published: 201704
Text Language: English
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 54
Accession Number: 2017-041909
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., strat. cols., 1 table, geol. sketch maps
N54°00'00" - N57°00'00", W116°00'00" - W110°00'00"
Secondary Affiliation: University of Lethbridge, CAN, Canada
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Canadian Science Publishing, NRC Research Press, Ottawa, ON, Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201723
Close Modal

or Create an Account

Close Modal
Close Modal