I help a lot of people find information and maps about Texas geology on a daily basis; this is a new discovery tool that may be of interest in your library: 

Explore Texas Geology http://tx.usgs.gov/texasgeology/

Direct link to the Explore Texas Geology viewer : http://txpub.usgs.gov/dss/texasgeology/

The History of Texas is Under Your Feet and at Your Fingertips!

"The ground under your feet is like a great history book. Looking at it can reveal ancient stories that include dinosaurs, volcanic eruptions, and clues to the formation of oil and gas and enchanted lands."

Enjoy the day,

Emily C. Wild
Librarian (Physical Scientist)
U.S. Geological Survey, Denver Library
Denver Federal Center
ph: (303) 236-1003
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USGS Libraries: http://library.usgs.gov

Tutorials: http://tinyurl.com/lh3tmua