#### U.S. GEOLOGICAL SURVEY BULLETIN 1839-K

## Stratigraphic Framework of Cambrian and Ordovician Rocks in the Central
Appalachian Basin from Medina County, Ohio, through Southwestern and
South-Central Pennsylvania to Hampshire County, West Virginia

### By Robert T. Ryder, Anita G. Harris, *and* John E. Repetski

### Revised and digitized by Robert D. Crangle,
Jr.

Version 2.0 (2003) (Originally published in 1992)

|Introduction

	  Oil and gas exploration in the Ohio, Pennsylvania, and West Virginia parts of the Appalachian basin, from the late 1950's to the middle 1980's, resulted in the drilling of a modest number of holes into Cambrian strata and (or) Precambrian basement rocks. On the basis of geophysical and lithologic logs from these drill holes and paleontologic data from one of these holes, we have drawn a 275-mi-long restored stratigraphic cross section through the Cambrian and Ordovician sequence from Medina County, Ohio, through southwestern and south-central Pennsylvania to Hampshire County, W. Va. (section C-C'). The stratigraphic framework of the Cambrian and Ordovician sequence along this cross section and, to a lesser extent, the structure of the underlying block-faulted basement rocks are the main topics of this paper.
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> Restored Stratigraphic Section of C-C', Plate
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