@misc{indiciaeb2463ab5be4f,
  title = {A geologic investigation of the early Proterozoic Irving Formation, Colorado},
  author = {David A. Gonzales},
  year = {1988},
  doi = {10.3133/ofr88660},
  url = {https://pubs.usgs.gov/publication/ofr88660},
  note = {Source identifier: ofr88660}
}