Digital data sets that describe aquifer characteristics of the Antlers aquifer in southeastern Oklahoma

This data set consists of digitized water-level elevation
contours for the Antlers aquifer in southeastern Oklahoma. The
Early Cretaceous-age Antlers Sandstone is an important source of
water in an area that underlies about 4,400-square miles of all
or part of Atoka, Bryan, Carter, Choctaw, Johnston, Love,
Marshall, McCurtain, and Pushmataha Counties. The Antlers
aquifer consists of sand, clay, conglomerate, and limestone in
the outcrop area. The upper part of the Antlers aquifer consists
of beds of sand, poorly cemented sandstone, sandy shale, silt,
and clay. The Antlers aquifer is unconfined where it outcrops in
about an 1,800-square-mile area.

The water-level elevation contours were digitized from a mylar
map at a scale of 1:250,000 that was used to prepare a final map
published at a scale of 1:500,000 in a ground-water modeling
report. Water levels measured in wells in 1970 were used to
construct the map. The water-level elevation contours for the
Antlers aquifer in Texas are not included in this data set. The
digital data set contains water-level elevations that range from
300 feet (in the east) to 900 feet (in the west) above sea level
or the National Geodetic Vertical Datum of 1929.