@misc{indiciae81d2a83a6858,
  title = {Geophysics: A reversal of geomagnetic polarity},
  author = {Edward A. Mankinen},
  year = {2015},
  doi = {10.1088/0031-9112/37/7/018},
  url = {https://pubs.usgs.gov/publication/70197163},
  note = {Source identifier: 70197163}
}