Structure contour map on the Precambrian unconformity surface in Ohio and related basement features, by M. T. Baranoski, 2002. Scale 1:500,000 (1 inch equals about 8 miles).
Preceded by DCMS-7, DCMS-11, and DCMS-12. Download the PDF for free from the Survey's Web site: www.OhioGeology.com.
While a digital version of PG-23 is available as a free download from the Division of Geological Survey website, the report is also being made available for purchase on CD-ROM.