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GEOREF RECORD

Late Wisconsin marine drift and associated sediments of the Lower Fraser Valley, British Columbia, Canada

John Edward Armstrong and William Lindop Brown
Late Wisconsin marine drift and associated sediments of the Lower Fraser Valley, British Columbia, Canada
Bulletin of the Geological Society of America (April 1954) 65 (4): 349-363

Abstract

During late Wisconsin time an assemblage of fossiliferous till-like stony clays and associated clays, silts sands, and gravels with an aggregate thickness of 500 feet was deposited in the Lower Fraser Valley of British Columbia. The authors believe these sediments were deposited in the sea during and following the wasting and retreat of a major Cordilleran ice sheet, and during subsequent uplift of the land above sea level. The agents of transportation probably were ice, including shelf-, berg-, and sea ice; glacial meltwater; and sea water. The writers believe the till-like stony clays, called glacial till by previous workers, had more than one origin, as follows: (1) The stony clays are in part marine drift; that is, the stones and some of the finer materials were transported by ice, and the remainder of the finer materials, predominantly clay, were transported by meltwater and sea water. Three modifications of this theory depend largely on how the stones were transported. These are (a) shelf-ice theory, (b) berg-ice theory, and (c) sea-ice theory. (2) The stony clays were in part deposited as a result of submarine erosion in the littoral and sublittoral zones from the action of submarine slides or slopewash, sea currents, and turbidity currents on pre-existing sediments, mainly till and till-like mixtures, during uplift following maximum advance of the ice sheet. The authors have termed this the submarine slopewash theory. The marine drift and slopewash theories are combined in a composite theory which also explains the origin of the associated sediments.


ISSN: 1050-9747
Coden: BUGMAF
Serial Title: Bulletin of the Geological Society of America
Serial Volume: 65
Serial Issue: 4
Title: Late Wisconsin marine drift and associated sediments of the Lower Fraser Valley, British Columbia, Canada
Pages: 349-363
Published: 195404
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1959-041667
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N48°25'00" - N60°00'00", W139°00'00" - W114°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1959
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