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GEOREF RECORD

Depositional patterns of the upper Devonian Waterways Formation, Swan Hills area, Alberta

N. M. Sheasby
Depositional patterns of the upper Devonian Waterways Formation, Swan Hills area, Alberta
Bulletin of Canadian Petroleum Geology (1971) 19 (2): 377-404

Abstract

The Waterways Formation is comprised of deeper-water sediments which envelop the Swan Hills Formation, an early Upper Devonian reef complex, in west-central Alberta. The interbedded shales and limestones of the formation range in thickness from less than 20 ft in the area of maximum reef development in the Swan Hills fields to more than 750 ft in the central portion of the basin eastward from the area of study. On the basis of electric-log correlations, the Waterways Formation was divided into eight major units (Units I-VIII). Isopach maps constructed from an overlying datum to the upper surface of each unit illustrate the depositional topography on which each subsequent unit was deposited. Stratigraphic cross-sections constructed perpendicular to regional strike illustrate a prograding type of basinfill process compatible with the Rich (1951) model. Sediments of the Waterways Formation in the Swan Hills area appear: (1) to have been transported from an eastern source area; (2) to have been deposited below wave base in an intermediate- to deep-water environment; and (3) to be significantly younger than the reef complex comprising the Swan Hills Formation. The lack of apparent shallow-water sediments or erosional surfaces suggests "starved basin" conditions in the area at the time of reef development, and supports the suggestion that the cessation of reef growth was due to "drowning" rather than subaerial erosion.


ISSN: 0007-4802
Coden: BCPGAI
Serial Title: Bulletin of Canadian Petroleum Geology
Serial Volume: 19
Serial Issue: 2
Title: Depositional patterns of the upper Devonian Waterways Formation, Swan Hills area, Alberta
Author(s): Sheasby, N. M.
Pages: 377-404
Published: 1971
Text Language: English
Publisher: Canadian Society of Petroleum Geologists, Calgary, AB, Canada
Accession Number: 1972-004874
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. (incl. sketch maps)
N49°00'00" - N60°00'00", W120°00'00" - W110°00'00"
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute.
Update Code: 1972
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