@misc{indiciaef47f5fece08e,
  title = {Palynology and microstratigraphy of Cretaceous-Tertiary boundary sections in southwestern North Dakota},
  author = {Douglas J. Nichols and K.R. Johnson},
  year = {2002},
  doi = {10.1130/0-8137-2361-2.95},
  url = {https://pubs.usgs.gov/publication/70221505},
  note = {Source identifier: 70221505}
}