@misc{indiciaeef60d517cace,
  title = {Palynologically calibrated vertebrate record from North Dakota consistent with abrupt dinosaur extinction at the Cretaceous-Tertiary boundary},
  author = {D.A. Pearson and T. Schaefer and K.R. Johnson and D. J. Nichols},
  year = {2001},
  doi = {10.1130/0091-7613(2001)029<0039:pcvrfn>2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70023697},
  note = {Source identifier: 70023697}
}