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Benthic Assemblages as Indicators of Sediment Stability: Evidence from Grainstones of the Harrodsburg and Salem Limestones (Mississippian, Indiana)

By
Howard R. Feldman
Howard R. Feldman
Departmentof Geology and Kansas Geological Survey University of Kansas Lawrence, Kansas, USA
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Mark A. Brown
Mark A. Brown
B. P. Exploration Inc. Houston, Texas, USA
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Allen W. Archer
Allen W. Archer
Department of Geology Kansas State University Manhattan, Kansas, USA
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Published:
January 01, 1993

Abstract

Within the Mississippian (Valmeyeran) strata of Indiana, the uppermost Harrodsburg and lowermost Salem limestones contain a variety of grain- stone facies that were deposited within a tide- and wave-dominated, shal- lowing-upward sequence. Compositions of autochthonous fossil assemblages in each facies are interpreted to have been constrained primarily by sediment stability. For example, echinoderm-bryozoan-brachiopod assemblages apparently thrived on stable substrates. Conversely, gastropod-domi- nated assemblages lived on frequently reworked, tidally influenced substrates. Low-diversity assemblages lived on substrates that were almost continually reworked. Faunal diversity decreased with increasing sediment mobility because of the increased (biological) energy required to maintain a life position at the sediment-water interface. Within modern analogs, a decrease in faunal diversity commonly correlates with increased sediment mobility.

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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

GeoRef

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