Key subsurface data help to refine Trinity aquifer hydrostratigraphic units, south-central Texas

Data Series 768
Prepared in cooperation with Camp Stanley Storage Activity, Parsons Corporation, and Weatherford Laboratories
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Abstract

The geologic framework and hydrologic characteristics of aquifers are important components for studying the nation’s subsurface heterogeneity and predicting its hydraulic budgets. Detailed study of an aquifer’s subsurface hydrostratigraphy is needed to understand both its geologic and hydrologic frameworks. Surface hydrostratigraphic mapping can also help characterize the spatial distribution and hydraulic connectivity of an aquifer’s permeable zones. Advances in three-dimensional (3-D) mapping and modeling have also enabled geoscientists to visualize the spatial relations between the saturated and unsaturated lithologies.


This detailed study of two borehole cores, collected in 2001 on the Camp Stanley Storage Activity (CSSA) area, provided the foundation for revising a number of hydrostratigraphic units representing the middle zone of the Trinity aquifer. The CSSA area is a restricted military facility that encompasses approximately 4,000 acres and is located in Boerne, Texas, northwest of the city of San Antonio. Studying both the surface and subsurface geology of the CSSA area are integral parts of a U.S. Geological Survey project funded through the National Cooperative Geologic Mapping Program. This modification of hydrostratigraphic units is being applied to all subsurface data used to construct a proposed 3-D EarthVision model of the CSSA area and areas to the south and west.

Study Area

Publication type Report
Publication Subtype USGS Numbered Series
Title Key subsurface data help to refine Trinity aquifer hydrostratigraphic units, south-central Texas
Series title Data Series
Series number 768
DOI 10.3133/ds768
Year Published 2014
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Geosciences and Environmental Change Science Center
Description 1 p.
Country United States
State Texas
Datum North American Datum of 1983
Projection Universal Transverse Mercator projection
Scale 100000
Online Only (Y/N) Y
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