المؤلفون: Cannon, William F.

المساهمون: Nicholson, Suzanne W., Nicholson, Suzanne W. Geochemistry, petrography, and volcanology of rhyolites of the Portage Lake volcanics, Keweenaw Peninsula, Michigan. 1992., Geological Survey (U.S.)

مصطلحات موضوعية: Geology, Stratigraphic -- Proterozoic., Volcanic ash, tuff, etc. -- Michigan., Rhyolite -- Michigan -- Keweenaw Peninsula.

جغرافية الموضوع: Porcupine Volcanics (Mich.), Bergland Group (Mich.), Copper Harbor Conglomerate (Mich.), Portage Lake Volcanics (Mich.)