@misc{indiciae66ab9c921642,
  title = {40Ar-39Ar ages of bentonite beds in the upper part of the Yazoo Formation (Upper Eocene), west-central Mississippi},
  author = {J. D. Obradovich and D. T. Dockery and C. C. Swisher},
  year = {1993},
  url = {https://pubs.usgs.gov/publication/70018289},
  note = {Source identifier: 70018289}
}