@misc{indiciae6eb609f0f7aa,
  title = {Foraminifera and stratigraphy of the upper part of the Pierre Shale and lower part of the Fox Hills Sandstone (Cretaceous), north-central South Dakota},
  author = {James F. Mello},
  year = {1969},
  doi = {10.3133/pp611},
  url = {https://pubs.usgs.gov/publication/pp611},
  note = {Source identifier: pp611}
}