@misc{indiciae2d8bc8eed935,
  title = {Physical stratigraphy of the Phosphoria formation in northwestern Wyoming},
  author = {Richard Porter Sheldon},
  year = {1955},
  doi = {10.3133/ofr55163},
  url = {https://pubs.usgs.gov/publication/ofr55163},
  note = {Source identifier: ofr55163}
}