Geologic map that depicts the surface geology of parts of Presidio, Brewster, and Terrell Counties, Texas. The 14-page booklet indicates geologic formations, abbreviations, and ages.

Integrated, detailed, and comprehensive study of the physical stratigraphy, tectonic history, hydrogeology, geomorphology, and resource potential of the Palo Duro and Dalhart Basins, Texas Panhandle, is part of a national evaluation of ancient salt basins as potential sites for isolation and management of nuclear wastes.

 In cooperation with several State and Federal agencies, the Bureau of Economic Geology has conducted several projects on the geology, origin, and extent of uranium resources in Texas. This volume, which was prepared in conjunction with a research colloquium sponsored by the Bureau, reviews and synthesizes the results of this research and demonstrates their applicability to the interpretation of uranium deposits.

Precambrian sedimentary rocks and associated mafic and silicic igneous rocks in Central Texas underwent a single episode of regional metamorphism about 1,050 million years (m.y.) ago. In the final stages of metamorphism great masses of granite and innumerable small pegmatite bodies intruded the older sedimentary and igneous rocks.