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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract

Pub. Id: A048 (1993)

First Page: 31

Last Page: 48

Book Title: SG 35: Mississippian Oolites and Modern Analogs

Article/Chapter: An Eolian Facies in the Ste. Genevieve Limestone of Southern Indiana: Chapter 3

Subject Group: Reservoirs--Carbonates

Spec. Pub. Type: Studies in Geology

Pub. Year: 1993

Author(s): Ralph E. Hunter

Abstract:

Cross-bedded oolitic grainstones in the Ste. Genevieve Limestone (Mississippian) of the Illinois basin have generally been considered to be shallow marine. However, fine- to medium-grained cross-bedded grainstones of mixed clast type in the Ste. Genevieve of Harrison County, southern Indiana, are here interpreted to be of eolian dune origin on the basis of small-scale sedimentary structures, particularly climbing-wind-ripple structures. In addition, subaerial exposure of surfaces at the tops and bases of the eolian units is indicated by pedogenic features such as in-situ breccias and rhizoliths. Associated skeletal and oolitic grainstones of marine origin are distinguished from the eolian grainstones by the presence of pebble-sized fossils. The presence of several interva s of eolian deposits in the Ste. Genevieve is probably a result of eustatic sea level fluctuations.

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