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Book Chapter

Wabamun Megasequence

By
F.A. Stoakes
F.A. Stoakes
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Published:
January 01, 1992

Abstract

This sequence comprises a thick succession of shallow-water ramp carbonates assigned to the Wabamun Group of Famennian age (Figure 1). In southern Alberta the section becomes evaporitic and is subdivided into the Stettler and Big Valley formations. In this account the open-marine Big Valley Formation is grouped within the overlying Banff cycle of sedimentation and as such is detailed in the next chapter. To the north and west, in northeast British Columbia, the Wabamun interval has equivalents into the Tetcho and Kotcho formations which shale out into the basinal Besa River Formation.

The Wabamun cycle marks a reflooding of the WCSB following the Winterburn cycle of basin fill (Figure 2). At the initiation of this cycle the underlying Winterburn succession had infilled practically all of the existing topography throughout most of Alberta and northeast British Columbia. Consequently, the lack of any significant precursor topography, meant that the Wabamun megasequence preserves a rather monotonous succession of low angle, mud-dominated ramps. The exception to this is around the Peace River Arch which existed, at least initially, as an "island" in the Wabamun sea. Here a number of shallow, fringing platforms existed. The superposition of muddy ramp cycles makes discerning depositional patterns and lateral shifts of facies belts in the Wabamun relatively difficult other than at its distal prolongation in northeast British Columbia or its landward transition into evaporites in southeast Alberta (Figure 4). Examination of these areas reveals that the bulk of the Wabamun section comprises an initial transgressive phase and a subsequent regressive phase.

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Contents

SEPM Short Course Notes

Devonian-Early Mississippian Carbonates of the Western Canada Sedimentary Basin: A Sequence Stratigraphic Framework

Jack Wendte
Jack Wendte
Institute of Sedimentary and Petroleum Geology, Geological Survey of Canada 3303 33rd Street N.W. Calgary, Alberta T2L 2A7
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Frank A. Stoakes
Frank A. Stoakes
Stoakes Campbell Geoconsulting Ltd. 500, 839 - 5th Avenue S.W. Calgary, Alberta T2P 3C8
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Clarence V. Campbell
Clarence V. Campbell
Stoakes Campbell Geoconsulting Ltd. 500, 839 - 5th Avenue S.W. Calgary, Alberta T2P 3C8
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SEPM Society for Sedimentary Geology
Volume
28
ISBN electronic:
9781565762510
Publication date:
January 01, 1992

GeoRef

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