@misc{indiciae1dce79fe24d6,
  title = {Stratigraphic revision of upper Miocene and lower Pliocene beds of the Chesapeake Group, middle Atlantic Coastal Plain},
  author = {Lauck W. Ward and Blake W. Blackwelder},
  year = {1980},
  doi = {10.3133/b1482d},
  url = {https://pubs.usgs.gov/publication/b1482D},
  note = {Source identifier: b1482D}
}