@misc{indiciae31ff31b0269c,
  title = {Middle and Lower Ordovician formations in southernmost Nevada and adjacent California},
  author = {R.J. Ross and C.R. Longwell},
  year = {1964},
  doi = {10.3133/b1180c},
  url = {https://pubs.usgs.gov/publication/b1180C},
  note = {Source identifier: b1180C}
}