Digital boundaries of the alluvial and terrace deposits along the Cimarron River from Freedom to Guthrie in northwestern Oklahoma

This data set was created for a project to develop data sets to support
ground-water vulnerability analysis. The objective was to create and document a
digital geospatial data set from a published report or map, or existing digital
geospatial data set that could be used in ground-water vulnerability analysis.

This data set consists of digital aquifer boundaries for the alluvial and
terrace deposits along the Cimarron River from Freedom to Guthrie in
northwestern Oklahoma. Ground water in 1,305 square miles of Quaternary-age
alluvial and terrace deposits along the Cimarron River from Freedom to Guthrie
is an important source of water for irrigation, industrial, municipal, stock,
and domestic supplies. Alluvial and terrace deposits are composed of
interfingering lenses of clay, sandy clay, and cross-bedded poorly sorted sand
and gravel. The aquifer is composed of hydraulically connected alluvial and
terrace deposits that uncomfortably overlie the Permian-age Formations.

The aquifer boundaries along geological contacts were extracted from published
digital geology data sets. Additional boundaries defining the geographic limits
of the aquifer and areas of less than 5 feet saturated thickness were digitized
from a mylar map, at a scale of 1:250,000. The maps were published at a scale
of 1:900,000.