The Chopawamsic Formation : a new stratigraphic unit in the Piedmont of northeastern Virginia - Southwick, D. L. (David Leroy), 1936-; Reed, John Calvin, 1930-; Mixon, Robert B.; United States Geological Survey (U.S.) (Washington, D.C. : United States Government Printing Office, 1971)
Bibliography: p. 10-11
Keywords: Geology, Stratigraphic -- Ordovician; Geology, Stratigraphic -- Cambrian; Geology -- Virginia -- Prince William Co; Geology -- Virginia -- Stafford Co