More than 30 years have elapsed since the ODNR Division of Geological Survey last published a statewide interpretation of the Precambrian unconformity surface. A large number of wells have been drilled to the Precambrian since that time, and revolutionary discoveries have changed our understanding of this ancient terrain. Map PG-23 and the accompanying report show the interpreted Precambrian unconformity surface and structural data currently available for the Precambrian surface in Ohio.
The print-on-demand, 1:500,000-scale (about 8 miles to the inch) color map and 18-page report can be downloaded for free in Adobe's Portable Document Format (PDF) or may be purchased from the Division of Geological Survey.
Download a PDF version of the Map and Report now. [2.35 MB]*
Printed Map price: $15.00. Includes printed 18 page report.
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CD-ROM price: $25.00. Includes pdfs of full sized map and 18 page report.
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Sales tax and shipping will be added to each order.