@misc{indiciae31e4ca5a49a1,
  title = {The Great Lakes tectonic zone: Revisited},
  author = {P.K. Sims and W. C. Day},
  year = {1993},
  doi = {10.3133/b1904s},
  url = {https://pubs.usgs.gov/publication/b1904S},
  note = {Source identifier: b1904S}
}