@misc{indiciae83d3cbef26b2,
  title = {Ordovician of the Sauk megasequence in the Ozark region of northern Arkansas and parts of Missouri and adjacent states},
  author = {Raymond L. Ethington and John E. Repetski and James R. Derby},
  year = {2012},
  doi = {10.1306/13331496m983496},
  url = {https://pubs.usgs.gov/publication/70045422},
  note = {Source identifier: 70045422}
}