@misc{indiciae24114b8743ae,
  title = {Clays Ferry Formation (Ordovician): A new map unit in south-central Kentucky},
  author = {Gordon Whitney Weir and Robert C. Greene},
  year = {1965},
  doi = {10.3133/b1224b},
  url = {https://pubs.usgs.gov/publication/b1224B},
  note = {Source identifier: b1224B}
}