@misc{indiciae8ccce612b751,
  title = {U-Pb zircon date from Avalonian Cape Breton Island and geochronologic calibration of the early Ordovician},
  author = {E. Landing and S. A. Bowring and R.A. Fortey and K.L. Davidek},
  year = {1997},
  doi = {10.1139/e17-059},
  url = {https://pubs.usgs.gov/publication/70019793},
  note = {Source identifier: 70019793}
}