@misc{indiciae0b1cbe357331,
  title = {Palynological and iridium anomalies at Cretaceous-Tertiary boundary, south-central Saskatchewan},
  author = {D. J. Nichols and D.M. Jarzen and C. J. Orth and P. Q. Oliver},
  year = {1986},
  doi = {10.1126/science.231.4739.714},
  url = {https://pubs.usgs.gov/publication/70014520},
  note = {Source identifier: 70014520}
}