@misc{indiciae7dddce81a7b9,
  title = {Mineralogy and petrology of the Cretaceous- Tertiary boundary clay bed and adjacent clay-rich rocks, Raton Basin, New Mexico and Colorado.},
  author = {R. M. Pollastro and C. L. Pillmore},
  year = {1987},
  doi = {10.1306/212f8b61-2b24-11d7-8648000102c1865d},
  url = {https://pubs.usgs.gov/publication/70014801},
  note = {Source identifier: 70014801}
}