Structure contours on the top of the Precambrian unconformity in Ohio

This data set was originally developed to update and revise the Precambrian unconformity surface in Ohio, document the location of Class-1 industrial waste disposal sites, location of brine disposal sites, locations with Precambrian paleotopographic erosional high areas and locations drilled into or proximal to the Precambrian unconformity surface and surrounding areas. RECOMMENDED BIBLIOGRAPHIC CITATION Baranoski, M.T., 2013, Structure contour map on the Precambrian unconformity surface in Ohio and related basement features (ver. 2.0): Columbus, Ohio Department of Natural Resources, Division of Geological Survey Map PG-23, scale 1:500,000, 17 p. text. Data Update Frequency: As Needed.