@misc{indiciae73421adcda41,
  title = {Radiometric ages of basement rocks in the northern Midcontinent, U.S.A.},
  author = {R. F. Marvin},
  year = {1988},
  doi = {10.3133/mf1835c},
  url = {https://pubs.usgs.gov/publication/mf1835C},
  note = {Source identifier: mf1835C}
}