@misc{indiciae8a7f9ed1e38e,
  title = {The Cretaceous-Tertiary boundary interval in Badlands National Park, South Dakota},
  author = {Philip W. Stoffer and Paula Messina and John A. Chamberlain and Dennis O. Terry},
  year = {2001},
  doi = {10.3133/ofr0156},
  url = {https://pubs.usgs.gov/publication/ofr0156},
  note = {Source identifier: ofr0156}
}