@misc{indiciaeb3f395770794,
  title = {Geologic map of the Potomac River gorge, Great Falls Park, Virginia, and part of the C\&O Canal National Historical Park, Maryland},
  author = {Scott Southworth and Carrie Fingeret and Thomas Weik},
  year = {2000},
  doi = {10.3133/ofr00264},
  url = {https://pubs.usgs.gov/publication/ofr00264},
  note = {Source identifier: ofr00264}
}