@misc{indiciae9bef8d680c25,
  title = {Stratigraphy and age of the Frontier Formation and associated rocks, central and southern Bighorn Basin, Wyoming - surface to subsurface correlation},
  author = {Mark A. Kirschbaum and E. Allen Merewether and Steven M. Condon},
  year = {2009},
  url = {https://pubs.usgs.gov/publication/70208032},
  note = {Source identifier: 70208032}
}