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November Bulletin

Stratigraphic Architecture, Depositional Systems of the Mississippian Upper Barnett Two Finger Sand Interval, Midland Basin, Texas

By Justin V. Mauck1,2, Robert G. Loucks2, and David J. Entzminger3

1 Schlumberger Technology Corporation, 7220 W Hwy 20, Midland, Texas 79706, U.S.A

2 Bureau of Economic Geology, Jackson School of Geosciences, University of Texas at Austin, University Station, Box X, Austin, Texas 78713–8924, U.S.A.

Evaporites in the McKnight Formation: Evidence for a Miocene Age to Fresh Water Flushing of the Maverick Basin, Southwest TexasBy Mark E. Thompson and M. Jeff RidingsPetroleum GeologistsSan Antonio, Texas IntroductionThe Maverick Basin is a relatively small depositional basin of Mesozoic age located in extreme southwest Texas (Fig. 1). The basin originated in the Late Triassic to Early Jurassic as a rift basin created during the early formation of the Gulf of Mexico.

September 2018 Bulletin

Luminescence chronology of a Mass Grave of Giant Gopher Tortoises (Gopherus hexagonatus), Willacy County, TX

By Randolph G. De La Garza¹² , Juan L. González¹, and Zhixiong Shen³

¹The University of Texas-Rio Grande Valley, Edinburg, Texas, U.S.A.

²Lund University, Lund, Sweden

³Coastal Carolina University, Conway, South Carolina, U.S.A.

Abstract

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).