Southwick, D. L.  1936- <br/><br/>
The Chopawamsic Formation :  a new stratigraphic unit in the Piedmont of northeastern Virginia / 
by D. L. Southwick, John C. Reed, Jr., and R. B. Mixon 
 - Washington, D.C. :  United States Government Printing Office,  1971 
 - iii, 11 p. :  map. ;  24 cm. 
 - Contributions to stratigraphy .
 - Geological Survey bulletin ;  Bull.no.1324-D .
<br/><br/>Bibliography: p. 10-11 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Stratigraphic--Ordovician<br/>Geology, Stratigraphic--Cambrian<br/>Geology--Virginia--Prince William Co.<br/>Geology--Virginia--Stafford Co.
<br/><br/><label>Dewey Class. No.: </label>551.7310975526