Geologic map that depicts the surface geology of parts of Jeff Davis, Reeves, Pecos, Terrell, Brewster, and Presidio Counties, Texas. The 9-page booklet indicates geologic formations, abbreviations, and ages.
Principal fault systems in the East Texas Basin were examined in terms of their distribution, geometry, displacement history, and possible origins.
The San Andres evaporitic sequence in the Palo Duro Basin comprises several thick carbonate units in its lower part and many thin units in its upperpart. To the south, across the Northern Shelf of the Midland Basin, evaporites pinch out and carbonates predominate.
The Frio Formation is one of the major Tertiary progradational wedges of the Texas Gulf Coast Basin and has yielded nearly 6 billion bbl of oil and 60trillion ft30f gas.