TY  - RPRT
TI  - The Chopawamsic Formation — A new stratigraphic unit in the Piedmont of northeastern Virginia
AU  - D. L. Southwick
AU  - John Calvin Reed
AU  - Robert B. Mixon
PY  - 1971
DO  - 10.3133/b1324d
UR  - https://pubs.usgs.gov/publication/b1324D
ID  - b1324D
ER  -