@misc{indiciaea879e7f199ae,
  title = {Geologic map of the Fort Logan quadrangle, Jefferson, Denver, and Arapahoe Counties, Colorado},
  author = {Robert M. Lindvall},
  year = {1978},
  doi = {10.3133/gq1427},
  url = {https://pubs.usgs.gov/publication/gq1427},
  note = {Source identifier: gq1427}
}