@misc{indiciae392ae5b52b00,
  title = {Preliminary geologic map of western Sonoma County and northernmost Marin County, California},
  author = {M. C. Blake and R. H. Wright and C. M. Wentworth},
  year = {1971},
  doi = {10.3133/ofr7144},
  url = {https://pubs.usgs.gov/publication/ofr7144},
  note = {Source identifier: ofr7144}
}