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Book Chapter

Depositional Aspects of Golconda Group (Chesterian) Oolite Bodies, Southwestern Illinois Basin

By
Clayton D. Harris
Clayton D. Harris
University of Southern Indiana Evansville, Indiana, USA
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G. H. Fraunfelter
G. H. Fraunfelter
Southern Illinois University Carbondale, Illinois, USA
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Published:
January 01, 1993

Abstract

The Golconda Group was deposited during the early to middle Chesterian, a time of transition in the Mississippian from when conditions favored ooid formation (Valmeyeran) to when conditions were unfavorable (late Chesterian). As a result, the Golconda is one of the youngest Chesterian carbonate units in the Illinois basin containing abundant ooids. Oolitic limestone is common along the western, southern, and eastern margins of the basin. Elsewhere, oolitic deposits are more sporadic and thin. The presence of a positive area (i.e., the Ozark dome) in Missouri induced conditions appropriate to ooid formation in the southwestern part of the basin. Antecedent topography formed by bioaccumulation also favored oolite deposition. Terrigenous influx and storm activity tended to discourage ooid formation. Although there are similarities between Valmeyeran and Chesterian oolite characteristics, notable differences exist.

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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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