@misc{indiciaeb9eeb8d7b5b3,
  title = {Planktonic marine diatom record of the past 18 m.y.: Appearances and extinctions in the Pacific and Southern Oceans},
  author = {J.A. Barron},
  year = {2003},
  url = {https://pubs.usgs.gov/publication/70024892},
  note = {Source identifier: 70024892}
}