@misc{indiciae1f4f484c4c2b,
  title = {Thickness of Upper Cretaceous Greenhorn Formation, Powder River basin, Wyoming and Montana},
  author = {J. E. Fox and Debra K. Higley},
  year = {1987},
  doi = {10.3133/ofr87340m},
  url = {https://pubs.usgs.gov/publication/ofr87340M},
  note = {Source identifier: ofr87340M}
}