@misc{indiciae3b04b74dba07,
  title = {Geologic map of the Fontana Quadrangle, San Bernardino and Riverside counties, California},
  author = {Douglas M. Morton},
  year = {1978},
  doi = {10.3133/ofr7819},
  url = {https://pubs.usgs.gov/publication/ofr7819},
  note = {Source identifier: ofr7819}
}