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Geological Survey Professional Paper 754C
The Portage Lake Volcanics (Middle Keweenawan) on Isle Royale, Michigan
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THE PORTAGE LAKE VOLCANICS (MIDDLE KEWEENAWAN) ON ISLE ROYALE, MICHIGAN
By N. King Huber
![cover of document](images/cover.jpg)
GEOLOGY OF ISLE ROYALE NATIONAL PARK, MICHIGAN
GEOLOGICAL SURVEY PROFESSIONAL PAPER 754C
Prepared in cooperation with the National Park Service
1973
TABLE OF CONTENTS
pp/754-C/index.htm
Last Updated: 22-Jan-2009
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