@misc{indiciaeb2093e0f2467,
  title = {Preliminary geologic map of the Richmond quadrangle, Alameda and Contra Costa counties, California},
  author = {T. W. Dibblee},
  year = {1980},
  doi = {10.3133/ofr801100},
  url = {https://pubs.usgs.gov/publication/ofr801100},
  note = {Source identifier: ofr801100}
}