Hydrogeologic framework bottom elevations and thicknesses of Permian, Upper Pennsylvanian, Lower Pennsylvanian, and Mississippian units in the Appalachian Plateaus Physiographic Province
Description
As part of the U.S. Geological Survey Water Availability and Use Science Program
study of Appalachian Plateaus aquifers, bottom elevations and thicknesses were
determined for Permian, Upper Pennsylvanian, Lower Pennsylvanian, and
Mississippian hydrogeologic framework units in the Appalachian Plateaus,
covering parts of Pennsylvania, Maryland, Ohio, West Virginia, Kentucky,
Virginia, Tennessee, Georgia, and Alabama. Thickness values for these
units were compiled at point locations from available sources (Martens,
1945; McKee and Crosby, 1975; Craig and Connor, 1979; Ryder and others,
2008, 2009, 2012, 2015) and used to interpolate surfaces representing
thicknesses, contact elevations, and outcrop elevations using earthVision
software (Dynamic Graphics, Inc., 2014). Unit contact and outcrop elevations
at cell centers from the earthVision rasters were used as the primary source
to create geodatabase rasters representing bottom elevations and thicknesses
of the Permian, Upper Pennsylvanian, Lower Pennsylvanian, and Mississippian
framework units.