--> Abstract: Delineation of Hydrogeologic Terranes in the Piedmont and Blue Ridge Physiographic Provinces: Southeastern and Mid-Atlantic United States, by T. O. Mesco; #90995 (1993).
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MESKO, THOMAS O., U.S. Geological Survey, Richmond, VA

ABSTRACT: Delineation of Hydrogeologic Terranes in the Piedmont and Blue Ridge Physiographic Provinces: Southeastern and Mid-Atlantic United States

In 1988, the U.S. Geological Survey began an appraisal of the regional groundwater and surface-water resources in the southeastern and mid-Atlantic areas of the United States as part of the Appalachian Valleys-Piedmont Regional Aquifer Systems Analysis (APRASA) study. The regional study was divided into two study units on the Previous HitbasisNext Hit of physiographic province: (1) the Valley and Ridge province, (2) and the Piedmont and Blue Ridge provinces on the Previous HitbasisNext Hit of hydraulic properties of crystalline and sedimentary rock. A geographic information system (GIS), digitized from state geologic maps, was used as a Previous HitbasisNext Hit to relate regional geology and lithology to discharge from more than 25,000 wells in the two provinces.

The approach included (1) assignment of rock lithology to each geologic formation in the GIS; (2) aggregation of all polygons containing the same rock lithology into lithologic groups; (3) the relation of specific well information, such as well discharge, to each lithologic group; (4) aggregation of all values of well discharge for each lithologic group; (5) determination of a median value of well discharge for each lithologic group; (6) the ranking of each lithologic group according to the median value of well discharge; and (7) assignment of each lithologic group to a hydrogeologic terrane on the Previous HitbasisTop of the rank of the median value of well discharge. Each terrane was delineated according to median well discharge categories, which ranged from 0 to 10 gal/min, >10 to 20 gal/min, gt;20 to 30 gas/min, >30 to 50 gal/min, and >50 gal/min. All five categories of median well discharge were identified in the Piedmont province in 33 lithologic groups. In the Blue Ridge province, only two ranges--0 to 10 and >10 to 20 gal/min were identified in 18 lithologic groups.

AAPG Search and Discovery Article #90995©1993 AAPG Eastern Section Meeting, Williamsburg, Virginia, September 19-21, 1993.