@misc{indiciaefba20b8f84f8,
  title = {Correlation chart of Frontier Formation from Greenhorn Range, southwestern Montana, to Mount Everts in Yellowstone National Park, Wyoming},
  author = {R. G. Tysdal and T. S. Dyman and D. J. Nichols and W. A. Cobban},
  year = {1990},
  doi = {10.3133/mf2116},
  url = {https://pubs.usgs.gov/publication/mf2116},
  note = {Source identifier: mf2116}
}