@misc{indiciae6b4b55591678,
  title = {A section of the Paleozoic formations of the Grand Canyon at the Bass trail},
  author = {L. F. Noble},
  year = {1923},
  doi = {10.3133/pp131b},
  url = {https://pubs.usgs.gov/publication/pp131B},
  note = {Source identifier: pp131B}
}