Aquifers of Texas

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Texas Water Development Board Report 345 Aquifers of Texas bY John B. Ashworth, Geologist and Janie Hopkins, Geologist November 1995 Aquifers of‘Texas November1935 Texas Water Development Board Craig D. Pedersen, Executive Administrator Texas Water Development Board William B. Madden, Chairman No6 Fernandez, Vice Chairman Charles W. Jenness, Member Elaine M. Barron, M.D., Member Lynwood Sanders, Member Charles L. Geren, Member Authorization for use or reproduction of any original material contained in this publication, i.e., not obtained from other sources, is freely granted. The Board would appreciate acknowledgement. Published and Distributed by the Texas Water Development Board P.O. Box 13231 Austin, Texas787 1 l-323 1 iii Aquifers of Texas November 1995 Table of Contents Page INTRODUCTION.. ................. 1 GENERAL GROUND-WATER PRINCIPLES.. 7 MAJOR AQUIFERS Ogallala. .......................... 10 Gulf Coast. ..................... 12 Edwards (Balcones Fault Zone). ..... 14 Carrizo-Wilcox. ................ 16 Trinity. ............................ 18 Edwards-Trinity (Plateau). ......... 20 Seymour. ......................... 22 Hueco-Mesilla Bolson. ..... 24 Cenozoic Pecos Alluvium. ....... 26 MINOR AQUIFERS Bone Spring-Victorio Peak. ...... 30 Dockum. ......................... 32 Brazos River Alluvium. ... 34 Hickoryv. ........................ 36 West Texas Bolsons. .......... 38 Queen City. ................. 40 Woodbine. .................. 42 Edwards-Trinity (High Plains). ... 44 Blaine. ........................ 46 Sparta. ........................ 48 Nacatoch. ...................... 50 52 lgneous. ......................... 54 Rita Blanca. .................... 56 Ellenburger-San Saba. ...... 58 Blossom. ....................... 60 Marble Falls. ................... 62 Rustler. ............................. 64 Capitan Reef Complex. ..

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Geophysical Mapping of Mount Bonnell Fault of Balcones Fault Zone
Geophysical mapping of Mount Bonnell fault of Balcones fault zone and its implications on Trinity-Edwards Aquifer interconnection, central Texas, USA Mustafa Saribudak1 Abstract There are up to 1200 ft (365 m) of total displacement across the Geophysical surveys (resistivity, natural potential [self-po- BFZ. Faults generally dip steeply (45–85°), varying primarily tential], conductivity, magnetic, and ground penetrating radar) due to specific rock properties and local stress fields (Ferrill and were conducted at three locations across the Mount Bonnell fault Morris, 2008). in the Balcones fault zone of central Texas. The normal fault has The BFZ includes the Edwards and Trinity aquifers, which hundreds of meters of throw and is the primary boundary between are primary sources of water for south-central Texas communities, two major aquifers in Texas, the Trinity and Edwards aquifers. including the city of San Antonio. The Trinity Aquifer underlies In the near surface, the fault juxtaposes the Upper Glen Rose the Edwards Aquifer through the Balcones fault zone. Formation on the Edwards Plateau, consisting of interbedded The BFZ’s most prominent fault is the Mount Bonnell, with limestone and marly limestone, against the Edwards Group, which a vertical throw of up to 600 ft (183 m) (Figure 1). The fault is mostly limestone, on the eastern down-thrown side (coastal hydrogeologically juxtaposes these Cretaceous carbonate aquifers plain). The Upper Glen Rose member is considered to be the during the Miocene tectonic deformation associated with the Upper Trinity Aquifer and also a confining zone underlying the Balcones fault zone, where the younger Edwards Group limestone Edwards Aquifer.
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LOCAL SPOTLIGHT Edwards Aquifer, San Antonio, Texas, United States—Protecting Groundwater
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Eastern Llano Texas; a Field David
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Groundwater Availability of the Barton Springs Segment of the Edwards Aquifer, Texas: Numerical Simulations Through 2050
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Economic Geology Resources of the Llano Uplift Region
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Edwards Aquifer Region 1615 N
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