@misc{indiciaec982a0592c6d,
  title = {Geological map and generalized cross sections of the coastal plain and adjacent parts of the Piedmont, Virginia},
  author = {R. B. Mixon and C. Rick Berquist and Wayne L. Newell and G.H. Johnson and D.S. Powars and J.S. Schindler and E.K. Rader},
  year = {1989},
  doi = {10.3133/i2033},
  url = {https://pubs.usgs.gov/publication/i2033},
  note = {Source identifier: i2033}
}