The Portage Lake Volcanics (Middle Keweenawan) on Isle Royale, Michigan
By: by N. King Huber.
Contributors: United States. National Park Service.
Series: The Geology of Isle Royale National Park, Michigan. Geological Survey professional paper; 754-C; Geological Survey professional paper ;; 754-C.
Publisher: U.S. Govt. Print. Off.
Published: 1973
Place of publication: Washington
Language: eng
Number of pages: 32
Subjects: Volcanic ash, tuff, etc. -- Michigan -- Isle Royale.; Geology, Stratigraphic -- Precambrian.; Geology -- Michigan -- Isle Royale.; Portage Lake Volcanics (Mich.)
Notes: Bibliography: p. C30-C32.
"Prepared in cooperation with the National Park Service."