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Strandline analysis in the southern basin of glacial Lake Agassiz, Minnesota and North and South Dakota, USA

Timothy G. Fisher
Strandline analysis in the southern basin of glacial Lake Agassiz, Minnesota and North and South Dakota, USA
Geological Society of America Bulletin (December 2005) 117 (11-12): 1481-1496

Abstract

Glacial Lake Agassiz, a large Pleistocene lake, left behind strandlines at multiple elevations within its basin. Prior researchers have used these strandlines to identify four relatively stable water level stages, but tracing them over long distances is often problematic. In this study, the elevation of the Tintah strandline is returned to its original designation, and a newly interpreted stable lake level at 1020-1030 ft (311-314 m) is referred to as the Upham level, based on a concentration of ridges and a spit at that elevation. Cores from strandline and lagoon complexes from the Milnor to Tintah beaches reveal a decreasing thickness of strandline sediment associated with shorter aggregate-length strandlines. This relationship is most likely controlled by sediment starvation, greater water level fluctuations and shallower water. Beaches near the head of the southern outlet spillway indicate that shoreline occupation at the Lower Campbell level was either very short-lived or strandline development was hampered by shallow water. The modern-day sill elevation between the southern outlet spillway and the lake basin is found to be 3 km south of White Rock, Minnesota, at an elevation of 974 ft (297 m). All but the Campbell strandlines at the southern outlet are interpreted as the result of a regression driven by incision of the southern outlet spillway.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 117
Serial Issue: 11-12
Title: Strandline analysis in the southern basin of glacial Lake Agassiz, Minnesota and North and South Dakota, USA
Author(s): Fisher, Timothy G.
Affiliation: University of Toledo, Department of Earth, Ecological, and Environmental Sciences, Toledo, OH, United States
Pages: 1481-1496
Published: 200512
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 55
Accession Number: 2005-072373
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch maps
N45°00'00" - N46°30'00", W97°00'00" - W96°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200523
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