@misc{indiciaeb426f4208f18,
  title = {Geologic map of the Lafayette quadrangle, Adams, Boulder, and Jefferson counties, Colorado},
  author = {M. N. Machette},
  year = {1975},
  doi = {10.3133/mf656},
  url = {https://pubs.usgs.gov/publication/mf656},
  note = {Source identifier: mf656}
}