@misc{indiciaec95a6d215cbe,
  title = {The ages of the continental, Upper Cretaceous, Fruitland Formation and Kirtland Shale based on a projection of ammonite zones from the Lewis Shale, San Juan Basin, New Mexico and Colorado},
  author = {James E. Fassett},
  year = {1987},
  doi = {10.1130/spe209-p5},
  url = {https://pubs.usgs.gov/publication/70207310},
  note = {Source identifier: 70207310}
}