@misc{indiciae4965ddbc5774,
  title = {Miocene cooling in the southwestern Powder River basin, Wyoming: Preliminary evidence from apatite fission-track analysis},
  author = {Nancy D. Naeser},
  year = {1992},
  doi = {10.3133/b1917o},
  url = {https://pubs.usgs.gov/publication/b1917O},
  note = {Source identifier: b1917O}
}