@misc{indiciae5f325ddbf3ab,
  title = {Conodont color alteration; an index to organic metamorphism},
  author = {Anita G. Epstein and Jack Burton Epstein and Leonard Dorreen Harris},
  year = {1977},
  doi = {10.3133/pp995},
  url = {https://pubs.usgs.gov/publication/pp995},
  note = {Source identifier: pp995}
}