@misc{indiciae71436c7838a2,
  title = {Preliminary geologic map of the Briones Valley Quadrangle, Alameda and Contra Costa counties, California},
  author = {T. W. Dibblee},
  year = {1980},
  doi = {10.3133/ofr80539},
  url = {https://pubs.usgs.gov/publication/ofr80539},
  note = {Source identifier: ofr80539}
}