@misc{indiciaebbceac10bcc9,
  title = {Lithostratigraphy of Upper Ordovician strata exposed in Kentucky, with a section on biostratigraphy},
  author = {Gordon Whitney Weir and Warren Lee Peterson and W. C. Swadley and John Pojeta},
  year = {1984},
  doi = {10.3133/pp1151e},
  url = {https://pubs.usgs.gov/publication/pp1151E},
  note = {Source identifier: pp1151E}
}