@misc{indiciae8a5fcbf04487,
  title = {Measured sections of the Montana Group and equivalent rocks from Montana and Wyoming},
  author = {James R. Gill and Robert E. Burkholder},
  year = {1979},
  doi = {10.3133/ofr791143},
  url = {https://pubs.usgs.gov/publication/ofr791143},
  note = {Source identifier: ofr791143}
}