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Designed for use with ArcView GIS 3.x and 8.x software products this data covers the Northwest 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 by John Estepp of the Surface Casing Division Texas Commission on Environmental Quality (TCEQ) in March 2004.
Geologic Atlas of Texas Sheets included in this data are Amarillo, Big Spring, Brownfield, Clovis, Dalhart, Hobbs, Lubbock, Perryton, Plainview, Tucumcari, and Wichita Falls-Lawton.
Estepp, John, 2004, Digital GIS Quadrangle - Northwest Texas: The University of Texas at Austin, Bureau of Economic Geology, Digital GIS Quadrangle - Northwest Texas (DQNW).