@misc{indiciaefc5848f1ac10,
  title = {Planktonic marine diatom record of the past 18 m.y.: Appearances and extinctions in the pacific and southern oceans},
  author = {John A. Barron},
  year = {2003},
  doi = {10.1080/0269249x.2003.9705588},
  url = {https://pubs.usgs.gov/publication/70222413},
  note = {Source identifier: 70222413}
}