@misc{indiciaefffc9d9aface,
  title = {Coccolith correlation of California Cenozoic geologic formations},
  author = {David Bukry},
  year = {1991},
  doi = {10.3133/ofr91574},
  url = {https://pubs.usgs.gov/publication/ofr91574},
  note = {Source identifier: ofr91574}
}