@misc{indiciaeede104fb6e8c,
  title = {Observations on the junction between the Eastern sandstone and the Keweenaw series on Keweenaw Point, Lake Superior},
  author = {Roland Duer Irving and Thomas C. Chamberlin},
  year = {1885},
  doi = {10.3133/b23},
  url = {https://pubs.usgs.gov/publication/b23},
  note = {Source identifier: b23}
}