@misc{indiciaeccd12f5a0c6e,
  title = {The carpenter fork bed, a new - and older - Black-shale unit at the base of the New Albany shale in central Kentucky: Characterization and significance},
  author = {S.F. Barnett and F.R. Ettensohn and R. D. Norby},
  year = {1996},
  url = {https://pubs.usgs.gov/publication/70018835},
  note = {Source identifier: 70018835}
}