USGS Logo Geological Survey Professional Paper 754—C
The Portage Lake Volcanics (Middle Keweenawan) on Isle Royale, Michigan


THE PORTAGE LAKE VOLCANICS (MIDDLE KEWEENAWAN) ON ISLE ROYALE, MICHIGAN


By
N. King Huber


cover of document


GEOLOGY OF ISLE ROYALE NATIONAL PARK, MICHIGAN
GEOLOGICAL SURVEY PROFESSIONAL PAPER 754—C

Prepared in cooperation with the National Park Service

1973


TABLE OF CONTENTS


pp/754-C/index.htm
Last Updated: 22-Jan-2009