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May 2018 Bulletin

Bedrock Geology and Hydrostratigraphy of the Edwards and Trinity Aquifers Within the

Driftwood and Wimberley 7.5-Minute Quadrangles, Hays and Comal Counties, Texas

By Allan K. Clark and Robert R. Morris

U.S. Geological Survey

Abstract

April 2018 Bulletin

Fault zone deformation and displacement partitioning in mechanically layered carbonates: The Hidden Valley fault, central Texas

David A. Ferrill, Alan P. Morris, Ronald N. McGinnis,

Kevin J. Smart, William C. Ward

Southwest Research Institute®, 6220 Culebra Road, San Antonio, Texas 78238, dferrill@swri.org

Acknowledgments

March 2018 Bulletin

“Geologic Wonders Of West Texas”

Abridged Chapters 7-10

Donald P. McGookey

Volcanism across the Trans-Pecos Region of West Texas

Volcanism in the Trans-Pecos region of West Texas was limited to the period from 48 to 17 m.y. ago (late Eocene to Early Miocene times.) During this time volcanism was nearly continuous, but varied considerably in location, style, composition, volume and tectonic setting (Henry and McDowell, 1986).