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Silurian rocks of northern Arkansas

By
O. A. Wise
O. A. Wise
Arkansas Geological Commission, 3815 W. Roosevelt Road, Little Rock, Arkansas 72204
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W. M. Caplan
W. M. Caplan
Arkansas Geological Commission, 3815 W. Roosevelt Road, Little Rock, Arkansas 72204
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Published:
January 01, 1988

Abstract

From Batesville, Arkansas, in Independence County, follow Arkansas 69 north to Cushman (Fig. 1). Turn left (west) on the county road (paved) just beyond the Cushman General Store. If you consider this intersection the zero point of a road log, the pavement ends at about mile 3.5 (5.6 km). At mi 5.1 (8.2 km) you will drive past a good outcrop of Ordovician age limestones of the Plattin, Kimmswick, and Fernvale formations. Of particular interest here is the Plattin-Kimmswick contact, which is sharp and “welded” as well as angular. The Plattin occurs in a small synclinal fold that is truncated by the basal sandy Kimmswick. An orange-colored zone several yards up the road marks a fault that lowers the Fernvale to a position adjacent to the Kimmswick at road level. (See W. W. Craig’s discussion of the lithologies of these units elsewhere in this volume.) At mi 7.0 (11.3 km) is the entrance to Love Hollow Quarry (Fig. 2). The outcrop described below can be found approximately 0.2 mi (0.3 km) north of Love Hollow.

The exposure consists of approximately 60 ft (18 m) of Brassfield, St. Clair, and Lafferty limestones. The shale on which the Brassfield rests at this locality is probably Ordovician age. The lithologic sequence consists of 4 ft (1.2 m) of spar-cemented, coarse fossil debris, overlain by 4 ft ( 1.2 m) of St. Clair, which in this locality is represented by a biomicrite. The contact at this point is slightly angular. The St. Clair is

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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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