@misc{indiciae65c9896ee4d8,
  title = {Stratigraphy, petrology, and provenance of the Albian Blackleaf Formation and the Cenomanian to Turonian lower part of the Frontier Formation in part of Beaverhead and Madison Counties, Montana},
  author = {T. S. Dyman and W. J. Perry and D. J. Nichols},
  year = {1988},
  url = {https://pubs.usgs.gov/publication/70014294},
  note = {Source identifier: 70014294}
}