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Eolian Structures and Textures in Oolitic-Skeletal Calcarenites from the Quaternary of San Salvador Island, Bahamas: A New Perspective on Eolian Limestones

By
Mario V. Caputo
Mario V. Caputo
Department of Geology and Geography Mississippi State University Mississippi State,Mississippi, USA
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Published:
January 01, 1993

Abstract

Calcarenites on San Salvador Island, Bahamas, preserve a history of ooids and skeletal grains reworked by wind. French Bay and Cockburn Town members of the Pleistocene Grotto Beach Formation and comparable Holocene strata contain eolian sandflow, grainfall, and wind-ripple structures and textures similar to those of siliciclastic eolian deposits. In thin section, well-cemented, closely packed, fine-grained strata correspond with ledges in outcrop; poorly cemented, loosely packed, medium-grained strata correspond with recesses. Wind-ripple strata form topsets, brinksets, and bottomsets. White, ledgy, fine-grained, basal laminae are overlain by gray, recessed, medium-grained laminae to form one wind-ripple stratum. Sandflow cross-strata are tabular in longitudinal sections, lenticular in transverse sections, and wedge out into grainfall and wind-ripple bottomsets. They coarsen upward from white, ledge-forming, fine-grained laminations to gray, recess-forming, medium-grained laminations. Grainfall forms weakly stratified, fine-grained, ledge-forming units of variable thickness and geometry. They are associated with sandflow cross-strata and thicken downslope as bottomsets, especially in cross-bed sets thinner than 2 m (7 ft). Grainfall strata are difficult to recognize where structural relations between foreset and bottomset beds are hidden.

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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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