@misc{indiciae6adc1e9f974b,
  title = {Thickness of Upper Cretaceous Lewis Shale, Powder River basin, Wyoming and Montana},
  author = {James E. Fox and Debra K. Higley},
  year = {1987},
  doi = {10.3133/ofr87340b},
  url = {https://pubs.usgs.gov/publication/ofr87340B},
  note = {Source identifier: ofr87340B}
}