@misc{indiciaeb07c8cf03ac1,
  title = {Minor-element composition and organic carbon content of marine and nonmarine shales of Late Cretaceous age in the western interior of the United States},
  author = {H. A. Tourtelot},
  year = {1964},
  doi = {10.1016/0016-7037(64)90008-0},
  url = {https://pubs.usgs.gov/publication/70010464},
  note = {Source identifier: 70010464}
}