1. Geologic map of the Milton quadrangle, Virginia-North Carolina and adjacent areas of Virginia Yale Public content 1972. 2012-11-09T20:47:59Z. 2012-11-09T20:47:59Z. Tobisch, Othmar T. (Othmar Tardin), 1932-. U.S. Geological Survey. English. Public. Virginia, Halifax County, North Carolina, Caswell County, and Person County.