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Book Chapter

Deltas and Other Coastal Environments

By
Published:
January 01, 1991

Abstract

The Dunvegan Formation (mid-Cenomanian) comprises a thick clastic wedge deposited in the West Alberta foreland basin. This wedge consists of a complex series of interbedded shales, siltstones, and sandstones and has been subdivided into seven allomembers (A-G), each separated by widespread flooding surfaces.

Allomember E consists of four offlapping, shingled, heterolithic sedimentary units that progressively built seaward to the southeast. Isolith maps of the sandstones within these shingles reveal deltaic morphologies consisting of well-developed sandy depositional lobes fed by sandy distributary channels separated by mudstone-dominated interchannel and interlobe areas. The plan-view morphologies and facies successions in the lobes are typical of prograding river-dominated delta fronts.

Superposition of sandbodies within each shingle reveals the autocyclic fashion in which the sedimentary basin was filled. The arcai pattern and scale of overlapping depositional delta lobes are similar to those of the Mississippi delta during the last 5 ka.

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Contents

Concepts in Sedimentology and Paleontology

The Three-Dimensional Facies Architecture of Terrigenous Clastic Sediments and its Implications for Hydrocarbon Discovery and Recovery

Andrew D. Miall
Andrew D. Miall
Geology Department, University of Toronto, Toronto, Ontario M5S 3B1, Canada
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Noel Tyler
Noel Tyler
Bureau of Economic Geology, The University of Texas at Austin, Austin, Texas 78713-7508 U.S.A.
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SEPM Society for Sedimentary Geology
Volume
3
ISBN electronic:
9781565762268
Publication date:
January 01, 1991

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