A series of two 1:500,000 scale maps showing the Geothermal resources of South Texas.

The purpose of this atlas is to provide a summary of research undertaken as part of a multiyear study (2009–2014) of Texas State Waters and the adjacent Federal Offshore continental shelf (i.e., near offshore waters of the State of Texas).

In the Rio Grande Embayment of South Texas, the Carrizo Formation (lower Eocene) consists of two sand-rich fluvial depositional systems that grade basinward into several deltaic complexes within the upper part of the Wilcox Group.

The Oakville Sandstone (Miocene) of the Texas Coastal Plain comprises a major sand-rich fluvial system composed of deposits of several major and minor rivers that originated within Texas and surrounding states.

The Oakville Sandstone is a major aquifer and a major host of uranium deposits in the Texas Coastal Plain.

The Oligocene-Miocene fluvial uranium host aquifers of the South Texas uranium province were deposited principally as syndepositionally oxidized sands and muds.

The Oakville Formation consists of sediments deposited by several major fluvial systems that traversed the Texas Coastal Plain during the Miocene Epoch.

The Miocene Oakville Sandstone is a major aquifer and uranium host beneath the Texas Coastal Plain. In 1976, approximately 6,000 acre-ft of ground water were withdrawn from the Oakville for municipal use.

The Sligo and Hosston Formations of Aptian age occur over thousands of square miles in the subsurface of South Texas.

The Smackover and lower part of the Buckner Formations (Oxfordian) comprise a thick regressive sedimentary sequence deposited on a Jurassic carbonate ramp. Four major depositional systems are recognized: (1) basinal, (2) low-energy open shelf, (3) high-energy shoal, and (4) sabkha.