Altitude and configuration of the predevelopment water table in the High Plains regional aquifer, northwestern Oklahoma

The High Plains aquifer in Oklahoma is part of a region~l aquifer
system extending from South Dakota on the north through Wyoming, Colorado,
Nebraska, Kansas, and Oklahoma to Texas and New Mexico o~ the south.
(index map). The principal aquifer, the Ogallala F?rmat1on of :ert1ary
age, is hydraulically connected with other unconsolidated ~eposits, .
principally of Quaternary age. Alluvium and terrace dep?sits htdrau]ically
connected with the Ogallala are included in the High Pla1ns.aqu1fer in
Oklahoma. Parts of the underlying bedrock also are hydraul 1cally connected
with the Ogallala. The High Plai ns aquifer in Oklahoma has been
removed by erosion on the west exposing underlying rocks of Cretaceous
age and on the east exposing rocks of Permian age.