@misc{indiciae40d87bebda57,
  title = {Geomagnetic polarity epochs},
  author = {Allan Cox and Richard R. Doell and G. Brent Dalrymple},
  year = {1964},
  doi = {10.1126/science.143.3604.351},
  url = {https://pubs.usgs.gov/publication/70221818},
  note = {Source identifier: 70221818}
}