@misc{indiciae264e7b03beaf,
  title = {Mid-Permian Phosphoria Sea in Nevada and the upwelling model},
  author = {Keith B. Ketner},
  year = {2009},
  doi = {10.3133/pp1764},
  url = {https://pubs.usgs.gov/publication/pp1764},
  note = {Source identifier: pp1764}
}