@misc{indiciaefc18bdc10f93,
  title = {Geology and paleontology of the Santa Maria district, California},
  author = {W. P. Woodring and M. N. Bramlette},
  year = {1950},
  doi = {10.3133/pp222},
  url = {https://pubs.usgs.gov/publication/pp222},
  note = {Source identifier: pp222}
}