@misc{indiciae05b428daab11,
  title = {Preliminary report on the paleontology of the Black Hills, containing descriptions of new species of fossils from the Potsdam, Jurassic, and Cretaceous formations of the Black Hills of Dakota},
  author = {R.P. Whitfeild and John Wesley Powell},
  year = {1877},
  doi = {10.3133/70039915},
  url = {https://pubs.usgs.gov/publication/70039915},
  note = {Source identifier: 70039915}
}