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GEOREF RECORD

Ice advances and retreats, inlets and outlets, sediments and strandlines of the western Lake Superior Basin

Howard C. Hobbs and Andy Breckenridge
Ice advances and retreats, inlets and outlets, sediments and strandlines of the western Lake Superior Basin (in Archean to Anthropocene; field guides to the geology of the Mid-Continent of North America, James D. Miller (editor), George J. Hudak (editor), Chad Wittkop (editor) and Patrick I. McLauglin (editor))
Field Guide (Geological Society of America) (September 2011) 24: 299-315

Abstract

This field guide examines the evidence for multiple readvances of the Superior lobe, as well as the morphological and sediment record of glacial lakes in the western Lake Superior Basin. During each readvance of the Superior lobe, ice went a shorter distance, reached a lower elevation, and laid down a finer-grained till due to incorporation of proglacial lake sediment. There are three distinct tills, which are correlated to three readvance phases: the St. Croix/Automba, Split Rock, and Nickerson. A red clay typically caps the stratigraphy at lower elevations in the basin. This clay may be a fourth till associated with a late readvance, perhaps equivalent to the Marquette phase in eastern Lake Superior. Alternatively, the red clay may be lacustrine. At issue are the potential hydraulic connections between glacial Lake Agassiz and the Atlantic Ocean during, and after, the Younger Dryas, because a readvance would fill the western Superior Basin with ice and prohibit eastern Lake Agassiz drainage. Additional stops highlight the strandline and sediment record of the youngest glacial lake phase (glacial Lake Duluth), including the inspection of Lake Superior sediment cores that are archived at the National Lacustrine Core Repository in Minneapolis. The goals of the selected stops are to underscore the current understanding of the late glacial history of the western Superior Basin and to provide new insights to spark discussion.


ISSN: 2333-0937
EISSN: 2333-0945
Serial Title: Field Guide (Geological Society of America)
Serial Volume: 24
Title: Ice advances and retreats, inlets and outlets, sediments and strandlines of the western Lake Superior Basin
Title: Archean to Anthropocene; field guides to the geology of the Mid-Continent of North America
Author(s): Hobbs, Howard C.Breckenridge, Andy
Author(s): Miller, James D.editor
Author(s): Hudak, George J.editor
Author(s): Wittkop, Chadeditor
Author(s): McLauglin, Patrick I.editor
Affiliation: Minnesota Geological Survey, St. Paul, MN, United States
Affiliation: University of Minnesota-Duluth, Department of Geological Sciences, Duluth, MN, United States
Pages: 299-315
Published: 201109
Text Language: English
Publisher: Geological Society of America, Boulder, CO, United States
References: 67
Accession Number: 2012-009904
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., sketch maps
N46°00'00" - N47°00'00", W93°00'00" - W91°30'00"
Secondary Affiliation: Natural Resources Research Institute, USA, United StatesMinnesota State University, USA, United StatesWisconsin Geological and Natural History Survey, USA, United StatesUniversity of Wisconsin-Superior, USA, United States
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: 201205
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