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Designed for use with ArcView GIS 3.x and 8.x software products this data covers the Southwest quadrant of Texas showing georeferenced 15-minute GAT (Geologic Atlas of Texas) map Sheet images in .tif format and scanned legend images. It was produced for the Bureau of Economic Geology by John Estepp of the Surface Casing Division Texas Commission on Environmental Quality (TCEQ) in March 2004.
Geologic Atlas of Texas (GAT) Sheets included in this data are Del Rio, Emory Peak-Presidio, Fort Stockton, Marfa, Pecos, San Angelo, Sonora, and Van Horn-El Paso.
Estepp, John, 2004, Digital GIS Quadrangle - Southwest Texas: The University of Texas at Austin, Bureau of Economic Geology, Digital Quadrangle - Southwest Texas (DQSW).