@misc{indiciae013f6b21fec7,
  title = {The Purisima Formation and related rocks (upper Miocene - Pliocene), greater San Francisco Bay area, central California; review of literature and USGS collection now housed at the Museum of Paleontology, University of California, Berkeley},
  author = {C.L. Powell},
  year = {1998},
  doi = {10.3133/ofr98594},
  url = {https://pubs.usgs.gov/publication/ofr98594},
  note = {Source identifier: ofr98594}
}