@misc{indiciae5a7baee4ec98,
  title = {Late Precambrian Sixtymile Formation and orogeny at top of the Grand Canyon Supergroup, northern Arizona},
  author = {Donald Parker Elston},
  year = {1979},
  doi = {10.3133/pp1092},
  url = {https://pubs.usgs.gov/publication/pp1092},
  note = {Source identifier: pp1092}
}