@misc{indiciae888c9ef85c88,
  title = {Age, stratigraphy, and correlations of the late Neogene Purisima Formation, central California coast ranges},
  author = {Charles L. Powell and John A. Barron and Andrei M. Sarna-Wojcicki and Joseph C. Clark and Frank A. Perry and Earl E. Brabb and Robert J. Fleck},
  year = {2007},
  doi = {10.3133/pp1740},
  url = {https://pubs.usgs.gov/publication/pp1740},
  note = {Source identifier: pp1740}
}