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(Article of periodic en Anglais - 1982)

Document title

Seismic reflection study of recessional moraines beneath Lake Superior and their relationship to regional deglaciation

Authors(s) and Affiliation(s)

LANDMESSER C. W. ; JOHNSON T. C. ; WOLD R. J. ;

Abstract

An offlapping sequence of glacial and glacial-lacustrine sediments overlying bedrock is recognized in west-central Lake Superior that is progressively younger to the northeast. Four facies are recognized on the basis of geomorphologic and acoustic properties and are interpreted to represent a southwest-to-northeast assemblage of: proglacial stratified drift (facies A), drift in major end moraines (facies B), till deposited as glacial retreat resumed, or possibly late-stage ablation till (facies C), and basal till (facies D). The prominent moraines of facies B are unusually thick and are believed to mark the ice-margin shorelines of successive major proglacial lakes that formerly occupied parts of western Lake Superior. The moraines are tentatively correlated with Glacial Lake Duluth (unit 1), Glacial Lake Washburn (unit 2), and Glacial Lake Beaver Bay (unit 3), the most prominent of lakes drained via the progressively lower outlets via the Moose Lake/Brule-St. Croix Rivers, the Huron Mountains, and the Au Train-Whitefish regions, respectively.

Source

Article of periodic

published at : Quaternary research New York

Editor :

Millesime : 1982, vol. 17, no2 [pp. 173-190]

Bibliographic references : 47 réf.

Language

Anglais

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