@misc{indiciaee7abec9eda67,
  title = {Palynology of the Cretaceous-Tertiary boundary in the northern Rocky Mountain and Mississippi Embayment regions},
  author = {Robert H. Tschudy},
  year = {1970},
  doi = {10.1130/spe127-p65},
  url = {https://pubs.usgs.gov/publication/70226482},
  note = {Source identifier: 70226482}
}