Digital data sets that describe aquifer characteristics of the Rush Springs aquifer in western Oklahoma

This data set consists of digitized aquifer boundaries for the
Rush Springs aquifer in western Oklahoma. This area encompasses
all or part of Blaine, Caddo, Canadian, Comanche, Custer, Dewey,
Grady, Stephens, and Washita Counties. Mark F. Becker
(U.S. Geological Survey, written commun., 1997) created an
aquifer boundary data set that represented hydrologic boundaries
needed to simulate the ground-water flow in the Rush Springs
aquifer with a computer model. In the ground-water flow model,
Mark F. Becker defined the Rush Springs aquifer to include the
Rush Springs Formation, alluvial and terrace deposits along
major streams, and parts of the Marlow Formations, particularly
in the eastern part of the aquifer boundary area.

The Permian-age Rush Springs Formation consists of highly
cross-bedded sandstone with some interbedded dolomite and
gypsum. The Rush Springs Formation is overlain by Quaternary-age
alluvial and terrace deposits that consist of unconsolidated
clay, silt, sand, and gravel. The Rush Springs Formation is
underlain by the Permian-age Marlow Formation that consists of
interbedded sandstones, siltstones, mudstones, gypsum-anhydrite,
and dolomite beds. The parts of the Marlow Formation that have
high permeability and porosity are where the Marlow Formation is
included as part of the Rush Springs aquifer (Mark F. Becker,
written commun., 1997).