@misc{indiciae7a2da18b4524,
  title = {A USGS Zonal Table for the Upper Cretaceous Middle Cenomanian--Maastrichtian of the Western Interior of the United States Based on Ammonites, Inoceramids, and Radiometric Ages},
  author = {William A. Cobban and Ireneusz Walaszczyk and John D. Obradovich and Kevin C. McKinney},
  year = {2006},
  doi = {10.3133/ofr20061250},
  url = {https://pubs.usgs.gov/publication/ofr20061250},
  note = {Source identifier: ofr20061250}
}