@misc{indiciae68ad148a8b1b,
  title = {U-Th-Pb zircon ages of some Keweenawan Supergroup rocks from the south shore of Lake Superior},
  author = {R. E. Zartman and S. W. Nicholson and W.F. Cannon and G. B. Morey},
  year = {1997},
  doi = {10.1139/e17-044},
  url = {https://pubs.usgs.gov/publication/70019942},
  note = {Source identifier: 70019942}
}