@misc{indiciae87faa2d7d74f,
  title = {Selected plant microfossil records of the terminal Cretaceous event in terrestrial rocks, western North America},
  author = {D. J. Nichols},
  year = {2007},
  doi = {10.1016/j.palaeo.2007.02.038},
  url = {https://pubs.usgs.gov/publication/70031221},
  note = {Source identifier: 70031221}
}