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Early Wisconsinan in the north-central part of the Lake Erie Basin; a new interpretation

Aleksis Dreimanis
Early Wisconsinan in the north-central part of the Lake Erie Basin; a new interpretation (in The last interglacial-glacial transition in North America, Peter U. Clark (editor) and Peter D. Lea (editor))
Special Paper - Geological Society of America (1992) 270: 109-118

Abstract

The Bradtville drift, the Canning till, and their correlatives in southwestern Ontario have been previously thought to be early Wisconsinan in age. Here another alternative is offered, whereby the Bradtville drift is assigned to the Illinoian stage, the lowermost Member A of the overlying Tyrconnell Formation to the late Sangamonian; Eowisconsinan, or the earliest part of early Wisconsinan, and its Member B to the early Wisconsinan substage. The age of the Canning till is still unknown. Member A of the Tyrconnell Formation is an accretion gley that formed about 20 m below the present level of Lake Erie, thus requiring a low outlet for the Erie basin. At that time, the Erie basin was drained probably by the buried Erigan channel, which extends about 50 m below the present level of Lake Erie. Member B of the Tyrconnell Formation is varved glaciolacustrine silt and clay, the deposition of which required a rise of lake level above the present one. This rise could have been caused by the Ontario lobe overriding the Niagara peninsula, possibly as far as Gowanda, New York; however, the ice margin remained in the eastern part of Lake Erie. The above hypothesis is supported by available lithologic and paleoecologic data from the region adjoining the north-central and eastern part of Lake Erie, but supporting numerical age determinations beyond the range of radiocarbon dating are still lacking.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 270
Title: Early Wisconsinan in the north-central part of the Lake Erie Basin; a new interpretation
Title: The last interglacial-glacial transition in North America
Author(s): Dreimanis, Aleksis
Author(s): Clark, Peter U.editor
Author(s): Lea, Peter D.editor
Affiliation: University of Western Ontario, Department of Geology, London, ON, Canada
Affiliation: Oregon State University, Department of Geosciences, Corvallis, OR, United States
Pages: 109-118
Published: 1992
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 0813722705
References: 44
Accession Number: 1993-006644
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sect., strat. col., sketch maps
N43°34'00" - N43°34'00", W80°16'00" - W80°16'00"
N41°22'30" - N42°55'00", W83°28'00" - W78°50'60"
N40°30'00" - N45°00'00", W79°45'00" - W71°55'00"
N38°25'00" - N42°00'00", W84°49'60" - W80°31'60"
Secondary Affiliation: Bowdoin College, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1993
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