@misc{indiciae4d7f020c2c60,
  title = {Pliocene environments and climates in the western United States},
  author = {R.S. Thompson},
  year = {1991},
  doi = {10.1016/0277-3791(91)90013-k},
  url = {https://pubs.usgs.gov/publication/70014990},
  note = {Source identifier: 70014990}
}