@misc{indiciae9889af733b60,
  title = {Paleomagnetic and 40Ar/39Ar geochronologic data from late Proterozoic mafic dikes and sills, Montana and Wyoming},
  author = {Stephen S. Harlan and John William Geissman and Lawrence W. Snee},
  year = {1997},
  doi = {10.3133/pp1580},
  url = {https://pubs.usgs.gov/publication/pp1580},
  note = {Source identifier: pp1580}
}