@misc{indiciaef61a268bb8ed,
  title = {Paleocene and Eocene stratigraphy of the northwestern Santa Ana Mountains, Orange County, California},
  author = {W. P. Woodring and W.P. Popenoe},
  year = {1945},
  doi = {10.3133/oc12},
  url = {https://pubs.usgs.gov/publication/oc12},
  note = {Source identifier: oc12}
}