Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian basin from Richland County, Ohio, to Rockingham County, Virginia

This chapter is a re-release of U.S. Geological Survey Miscellaneous Investigations Series Map I-2264, of the same title, by Ryder (1991; online version 1.0 revised and digitized by Robert D. Crangle, Jr., 2003). Version 1.0 is a digital version of the original and also includes the gamma-ray well log traces.