@misc{indiciae2a255152e72a,
  title = {Palynology and palynostratigraphy of the Hell Creek Formation in North Dakota: A microfossil record of plants at the end of Cretaceous time},
  author = {Douglas J. Nichols},
  year = {2002},
  doi = {10.1130/0-8137-2361-2.393},
  url = {https://pubs.usgs.gov/publication/70221501},
  note = {Source identifier: 70221501}
}