Drake, Avery Ala,  1927- <br/><br/>
The Accotink schist, Lake Barcroft metasandstone, and Popes Head Formation--keys to an understanding of the tectonic evolution of the northern Virginia Piedmont / 
by Avery Ala Drake, Jr., and Peter T. Lyttle 
 - Washington, D.C. :  United States Government Printing Office,  1981 
 - iv, 16 p. :  ill., maps (1 fold. col. in pocket) ;  29 cm. 
 - Geological Survey professional paper ;  no.1205 .
<br/><br/>Bibliography: p. 15-16 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Stratigraphic--Cambrian--Cambrian<br/>Schist--Virginia, Northern<br/>Sandstone--Virginia, Northern<br/>Geology--Virginia, Northern
<br/><br/><label>Dewey Class. No.: </label>551.72309755291