@misc{indiciae8a8e95518a06,
  title = {Biostratigraphy of the Tertiary strata of the core},
  author = {T. G. Gibson and George W. Andrews and Laurel M. Bybell and R. J. Witmer and D. S. Van Nieuwenhuise},
  year = {1980},
  url = {https://pubs.usgs.gov/publication/70208847},
  note = {Source identifier: 70208847}
}