@misc{indiciae044d8b127c49,
  title = {Preliminary geologic map of Marin and San Francisco Counties and parts of Alameda, Contra Costa and Sonoma Counties, California},
  author = {M.C. Blake and J. A. Bartow and V. A. Frizzell and J. Schlocker and D. Sorg and C. M. Wentworth and R. H. Wright},
  year = {1974},
  doi = {10.3133/mf574},
  url = {https://pubs.usgs.gov/publication/mf574},
  note = {Source identifier: mf574}
}