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Age determination for glacial Lake Agassiz shorelines west of Fargo, North Dakota, USA

Kenneth Lepper, Kelly L. Gorz, Timothy G. Fisher and Thomas V. Lowell
Age determination for glacial Lake Agassiz shorelines west of Fargo, North Dakota, USA
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (July 2011) 48 (7): 1199-1207

Abstract

Understanding the evolution of Lake Agassiz is vital to developing a comprehensive late Quaternary history of central North America. Although many of the geomorphic features of the lake are well known, current reconstructions primarily depend upon relative ages of landforms. Here, we report new optically stimulated luminescence (OSL) ages on a flight of strandlines located 140 km north of the southern outlet. Strandline ages at this location range from 14.3 + or - 0.2 to 10.0 + or - 0.2 ka cal, spanning 4000 years of lake history. Using geomorphic relationships and OSL age control, it is proposed that the Herman through Tintah strandlines developed over a period of <1000 years followed by a hiatus of strandline development until the Campbell strandline developed at 10.3 + or - 0.2 ka cal. There is agreement between our new OSL dates and OSL and radiocarbon ages from geomorphically correlative landforms elsewhere in the lake basin. The use of high-resolution LiDAR imagery greatly aids localized mapping of shoreline features. Additional site-specific field work and OSL ages are necessary to further evaluate strandline tracing across the basin.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 48
Serial Issue: 7
Title: Age determination for glacial Lake Agassiz shorelines west of Fargo, North Dakota, USA
Affiliation: North Dakota State University, Department of Geosciences, Fargo, ND, United States
Pages: 1199-1207
Published: 201107
Text Language: English
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 26
Accession Number: 2012-039767
Categories: Quaternary geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., 3 tables, geol. sketch maps
N46°52'00" - N47°00'00", W97°28'00" - W97°16'60"
Secondary Affiliation: University of Toledo, USA, United StatesUniversity of Cincinnati, USA, United States
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201221
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