@misc{indiciae4c10799ee78c,
  title = {Map showing total thickness of the Lakota Formation and equivalent rocks, Montana},
  author = {Richard D. Feltis},
  year = {1982},
  doi = {10.3133/wri824026},
  url = {https://pubs.usgs.gov/publication/wri824026},
  note = {Source identifier: wri824026}
}