@misc{indiciae6afe1f45d27b,
  title = {Minimum age of the lower Devonian Slate near Jackman, Maine},
  author = {Patrick M. Hurley and A. J. Boucot and A. L. Albee and H. Faul and W.H. Pinson and Harold W. Fairbairn},
  year = {1959},
  doi = {10.1130/0016-7606(1959)70[947:maotld]2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70211668},
  note = {Source identifier: 70211668}
}