@misc{indiciaecb3adf26e226,
  title = {Geologic map of the Madison Roadless Area, Gallatin and Madison counties, Montana},
  author = {R. G. Tysdal and F. S. Simons},
  year = {1985},
  doi = {10.3133/mf1605b},
  url = {https://pubs.usgs.gov/publication/mf1605B},
  note = {Source identifier: mf1605B}
}