@misc{indiciae8e28f4e0b662,
  title = {Depositional environment of the middle Proterozoic Spokane Formation; Empire Formation transition zone, west-central Montana},
  author = {James W. Whipple},
  year = {1980},
  doi = {10.3133/ofr801232},
  url = {https://pubs.usgs.gov/publication/ofr801232},
  note = {Source identifier: ofr801232}
}