@misc{indiciaee2274cbaaac2,
  title = {Correlation chart of lower and upper Cretaceous Blackleaf Formation, eastern Pioneer Mountains, southwestern Montana, to Drummond, central-western Montana},
  author = {T. S. Dyman and R. G. Tysdal and C. A. Wallace and S.E. Lewis},
  year = {1994},
  doi = {10.3133/i2478},
  url = {https://pubs.usgs.gov/publication/i2478},
  note = {Source identifier: i2478}
}