@misc{indiciae1b93a0a410a0,
  title = {Depositional environments for strata of composite section of Frontier Formation, Madison Range, southwestern Montana},
  author = {Russell G. Tysdal},
  year = {1991},
  doi = {10.3133/b1949},
  url = {https://pubs.usgs.gov/publication/b1949},
  note = {Source identifier: b1949}
}