@misc{indiciae7d993a54b19f,
  title = {Age of the Morton and Montevideo gneisses and related rocks, southwestern Minnesota},
  author = {S. S. Goldich and C. E. Hedge and T. W. Stern},
  year = {1970},
  doi = {10.1130/0016-7606(1970)81[3671:aotmam]2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70226547},
  note = {Source identifier: 70226547}
}