@misc{indiciae67da443ef734,
  title = {Revisions of stratigraphic nomenclature within the Keweenawan Supergroup of Northern Michigan. Geochemistry, petrography, and volcanology of rhyolites of the Portage Lake volcanics, Keweenaw Peninsula, Michigan},
  author = {William F. Cannon and Suzanne W. Nicholson},
  year = {1992},
  doi = {10.3133/b1970ab},
  url = {https://pubs.usgs.gov/publication/b1970AB},
  note = {Source identifier: b1970AB}
}