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Book Chapter

The Claiborne Group in southwest Arkansas

By
William Lee Prior
William Lee Prior
Arkansas Geological Commission, Little Rock, Arkansas 72204
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Quin Baber
Quin Baber
Arkansas Geological Commission, Little Rock, Arkansas 72204
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Published:
January 01, 1988

Abstract

Although the middle Eocene age Claiborne Group of southwest Arkansas covers a large area, outcrops are sparse. The easily erodable Claiborne is composed of unconsolidated sand, silt, clay, and lignite. It has a maximum thickness of 1,500 ft (457 m) in Arkansas, generally strikes to the northeast, and dips an average 60 ft to the mi (11 m to the km) to the southeast. The exposures at Camden and Red River in southwestern Arkansas (Fig. 1) display features of a deltaic plain environment. The two exposures are 75 mi ( 120 km) apart and are probably of different parts of the Claiborne section. Currently, the Claiborne Group is interpreted as having accumulated in fluvial-deltaic system. Studies by Bernard and others (1970) have established a classification scheme of sedimentary environments within deltas. Texture, fabric, sedimentary features, geometry, and trends of sediments associated with deltas are controlled by geologic processes and the availability and influx of different sediment types. Based on these criteria, delta depositional environments have been divided into (1) delta plain with natural levees, distributary channels, interdistributary marshs, and flood basins; (2) inner fringe with rivermouth bars; (3) outer fringe; (4) prodelta; and (5) open marine (Figs. 2 and 3). These environments are discussed within the context of high sediment influx, low energy type of coastal delta (birdfoot, lobate) interpretation of the Claiborne Depositional system, as opposed to low sediment, high coastal energy deltas (arcuate, estuarine).

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Contents

DNAG, Centennial Field Guides

South-Central Section of the Geological Society of America

O. T. Hayward
O. T. Hayward
Geology Department, Baylor University, Waco, Texas 76798
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Geological Society of America
Volume
4
ISBN electronic:
9780813754109
Publication date:
January 01, 1988

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