@misc{indiciaede773c5a199e,
  title = {The foraminiferal fauna of the Upper Cretaceous Arkadelphia marl of Arkansas},
  author = {J.A. Cushman},
  year = {1949},
  doi = {10.3133/pp221a},
  url = {https://pubs.usgs.gov/publication/pp221A},
  note = {Source identifier: pp221A}
}