Geologic map that depicts the surface geology of Gaines and Andrews Counties and parts of Yoakum, Terry, Dawson, Martin, Winkler, Ector, and Midland Counties, Texas. The 5-page booklet indicates geologic formations, abbreviations, and ages.

Historical monitoring along Matagorda Island and San Jose Island records the nature and magnitude of changes in position of the shoreline and vegetation line and provides insight into the factors affecting those changes.

The Bureau of Economic Geology has been conducting regional studies of the Frio Formation along the Texas Gulf Coast to evaluate potential geothermal energy from deep, geopressured sandstone reservoirs (Bebout, Dorfman, and Agagu, 1975; Bebout, Agagu, and Dorfman, 1975).