@misc{indiciaef8ae13f4bdd0,
  title = {Paleomagnetic poles and polarity zonation from Cambrian and Devonian strata of Arizona},
  author = {D. P. Elston and S.L. Bressler},
  year = {1977},
  doi = {10.1016/0012-821x(77)90067-x},
  url = {https://pubs.usgs.gov/publication/70009919},
  note = {Source identifier: 70009919}
}