1. Geologic cross section D-D' through the Appalachian Basin from the Findlay Arch, Sandusky County, Ohio, to the Valley and Ridge Province, Hardy County, West Virginia Yale Public content 2009. 2009-07-27T20:08:51Z. 2012-05-03T16:07:53Z. U.S. Geological Survey ; Information Services [distributor]. English. Public. Appalachian Basin.