Skip to Main Content
Book Chapter

Middle and Upper Pennsylvanian (Atokan-Missourian) strata in the Colorado River Valley of Central Texas

Robert C. Grayson, Jr.
Robert C. Grayson, Jr.
Department of Geology, Baylor University, Waco, Texas 76798
Search for other works by this author on:
E. L. “Jack” Trite
E. L. “Jack” Trite
Marshall Exploration, P.O. Box 1689, Marshall, Texas 75670
Search for other works by this author on:
January 01, 1988


The Middle and Upper Pennsylvanian stratigraphic sequence of Central Texas is exposed in a triangular shaped region that is bisected by the Colorado River (Fig. 1). This succession of strata (Fig. 2) is illustrated in this double-site guide. Site 78 begins in San Saba County near Bend, Texas, where exposures of the Marble Falls Limestone, Smithwick Shale, and lower “Strawn” Group are available for study. Three additional localities in San Saba and Mills counties permit special emphasis on the depositional character of the lower “Strawn” Group. The upper Strawn Group, Site 79, is seen along a transect across the outcrop belt in San Saba and McCulloch Counties. Single localities at opposite ends of the outcrop belt in San Saba and Brown Counties (Fig. 1) further document the various lithologies and stratigraphic relationships of the upper unit.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables


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
ISBN electronic:
Publication date:
January 01, 1988




A comprehensive resource of eBooks for researchers in the Earth Sciences

This Feature Is Available To Subscribers Only

Sign In or Create an Account

This PDF is available to Subscribers Only

View Article Abstract & Purchase Options

For full access to this pdf, sign in to an existing account, or purchase an annual subscription.

Subscribe Now