@misc{indiciae18d9368dd4c9,
  title = {Contributions to Late Cretaceous stratigraphy and paleontology, western Montana},
  author = {T. S. Dyman and J. C. Haley and W. J. Perry and R. G. Tysdal and D. J. Nichols and W. A. Cobban},
  year = {1991},
  doi = {10.3133/b1962},
  url = {https://pubs.usgs.gov/publication/b1962},
  note = {Source identifier: b1962}
}