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Tidal Origin of a Mississippian Oolite on the West Virginia Dome

By
Richard Smosna
Richard Smosna
Department of Geology & Geography West Virginia University Morgantown, West Virginia, USA
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Bryan Koehler
Bryan Koehler
The Advent Group,Inc. Brentwood, Tennessee, USA
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Published:
January 01, 1993

Abstract

Petrographic descriptions, sedimentary structures, and facies analysis document the predominantly tidal control on deposition of the Pickaway Limestone. Cross-bedded ooid-peloid grainstones accumulated over the West Virginia dome as decimeter-sized intertidal sand waves and metersized subtidal sand waves. Evidence of tidal sedimentation includes bidirectional foresets, tidal bedding, mud drapes, reverse grading, wavy bedding, reactivation surfaces, and tidal bundles. Sand holes, desiccation cracks, mud chips, and interbeds of red shale and finely crystalline dolomite formed during periods of subaerial exposure, whereas ripple bedding hints of occasional wave activity. Storms passing over the sand waves produced thin sets of trough cross-beds and plane beds. Major storms also led to the migration of the subtidal sand waves over other facies. In the quiet offshore environment, pelletal-skeletal packstones and wackestones were deposited, although advancing spillover lobes or tempestites produced interbedded sets of ooid grainstone.

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Contents

AAPG Studies in Geology

Mississippian Oolites and Modern Analogs

Brian D. Keith
Brian D. Keith
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Charles W. Zuppann
Charles W. Zuppann
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American Association of Petroleum Geologists
Volume
35
ISBN electronic:
9781629811017
Publication date:
January 01, 1993

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