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

STGS Spring Field Trip - Texas Drainage Tunnel
April 11th, 2026
This field trip will deepdive, literally, 200 hundred feet into the tunneling (more...)