@misc{indiciae7c174a24c4b7,
  title = {An early Reticuloceras Zone fauna from the Hale Formation in northwestern Arkansas},
  author = {Mackenzie Gordon},
  year = {1968},
  doi = {10.3133/pp613a},
  url = {https://pubs.usgs.gov/publication/pp613A},
  note = {Source identifier: pp613A}
}