@misc{indiciae68be2604ce5f,
  title = {Frontier Formation and equivalent rocks in eastern Wyoming},
  author = {E. Allen Merewether and W. A. Cobban and E.T. Cavanaugh},
  year = {1979},
  url = {https://pubs.usgs.gov/publication/70208028},
  note = {Source identifier: 70208028}
}