@misc{indiciae6000164f1624,
  title = {Measured stratigraphic section of the Upper Cretaceous Frontier Formation near McLeod, Sweet Grass County, Montana},
  author = {R. G. Tysdal and D. J. Nichols},
  year = {1989},
  doi = {10.3133/ofr89655},
  url = {https://pubs.usgs.gov/publication/ofr89655},
  note = {Source identifier: ofr89655}
}