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Environment Analysis of a Silurian Patch Reef, Lockport Dolomite of West Virginia

By
Richard Smosna
Richard Smosna
Department of Geology and Geography, West Virginia University, Morgantown, West Virginia 26506
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Steven M. Warshauer
Steven M. Warshauer
Tenneco Oil Company, Frontier Exploration, Houston, Texas 77001
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Published:
January 01, 1983

Abstract

A coral-stromatoporoid reef has been recognized from a core in the Lockport Dolomite of West Virginia, and interreef dolomite was recovered in a second core from a nearby well. Submerged topographic highs on the sea floor, a relic of sand bars in the underlying Keefer Sandstone, provided an optimum site for Lockport organic growth. Local relief protected the reef community from being smothered by terrigenous material. Simultaneously, argillaceous interreef sediments accumulated in deeper water between topographic highs. The reef, though small, consists of three vertical biofacies. The buildup began as a thicket of current-baffling crinoids. They colonized the muddy, shallow-subtidal sea floor after an initial transgression. Skeletal debris of this bafflestone facies gradually changed the consistency of the sea floor; the substrate became firmer and the crinoids were supplanted by a community of stick corals. The substrate coarsened with the admixture of coral skeletons, and the reef was eventually capped by a frame-building stromatoporoid community. In contrast to other Niagaran reefs, the vertical succession of biofacies was not due to upward reef growth above wave base. The patch reef in the Lockport Dolomite developed in a quiet, protected shelf setting, and community succession was controlled intrinsically resulting from continual alteration of the sea floor by the reef organisms themselves.

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Contents

SEPM Core Workshop Notes

Carbonate Buildups-A Core Workshop

Paul M. Harris
Paul M. Harris
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SEPM Society for Sedimentary Geology
Volume
4
ISBN electronic:
9781565762596
Publication date:
January 01, 1983

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