@misc{indiciaece070166622a,
  title = {Invertebrate Paleontology of the Wilson Grove Formation (Late Miocene to Late Pliocene), Sonoma and Marin Counties, California, with some Observations on Its Stratigraphy, Thickness, and Structure},
  author = {Charles L. Powell and James R. Allen and Peter J. Holland},
  year = {2004},
  doi = {10.3133/ofr20041017},
  url = {https://pubs.usgs.gov/publication/ofr20041017},
  note = {Source identifier: ofr20041017}
}