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Gulfian rocks, western margin of the East Texas Basin

By
O. T. Hayward
O. T. Hayward
Department of Geology, Baylor University, Waco, Texas 76798
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Published:
January 01, 1988

Abstract

The Gulfian section of Central Texas is illustrated by a transect extending from northwestern Hill County southeastward to northeastern Limestone County (Figs. 1 to 6). This transect begins in latest Washita rocks of Comanchean age (locality 1; Figs. 1, 3), and crosses in succession the outcrop belts of Woodbine Sand (localities 1 and 2; Fig. 3); Eagle Ford Group (locality 3; Fig. 4); Austin Chalk (locality 4; Fig. 4); Taylor Group (locality 5; Fig. 5); and Navarro Group, all of Gulfian age, to end at the Midway Group (locality 6; Fig. 6) of Paleocene Age (Hill, 1901; Adkins, 1933; Bureau of Economic Geology, 1970, 1972). Structurally, it originates near the eastern margin of the Central Texas Platform (Fig. 3), and trends downdip across the northern end of the Balcones Fault Zone (Fig. 4) into the East Texas Basin (Fig. 3), to terminate in the Mexia Fault Zone (Fig. 6; Oliver, 1971). Geomorphically it begins at the eastern margin of the Grand Prairies (Fig. 3), and crosses the Eastern Cross Timbers and the Black Prairies (Figs. 4,5, 6) to end at the western margin of the East Texas Timber Belt (Fig. 6; Hill, 1901 ). Throughout this route, the geology, landscape, history, and land use are clearly related.

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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
Search for other works by this author on:
Geological Society of America
Volume
4
ISBN electronic:
9780813754109
Publication date:
January 01, 1988

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