@misc{indiciaeca3b0764e7a3,
  title = {Geologic Cross Section I–I′ Through the Appalachian Basin from the Eastern Margin of the Illinois Basin, Jefferson County, Kentucky, to the Valley and Ridge Province, Scott County, Virginia},
  author = {Robert T. Ryder and Michael H. Trippi and Christopher S. Swezey},
  year = {2015},
  doi = {10.3133/sim3343},
  url = {https://pubs.usgs.gov/publication/sim3343},
  note = {Source identifier: sim3343}
}