@misc{indiciae7b7676102a51,
  title = {Geologic, biostratigraphic, and structure map of the Pierre Shale between Loveland and Round Butte, Colorado},
  author = {G. R. Scott and W. A. Cobban},
  year = {1986},
  doi = {10.3133/i1700},
  url = {https://pubs.usgs.gov/publication/i1700},
  note = {Source identifier: i1700}
}