I just ran across this field trip report from last season, published by The Institute on Lake Superior Geology. It's a very interesting Field Guide to Isle Royale Geology compiled by geologists from Michigan Tech University.
Online version:
http://www.geo.mtu.edu/~raman/SilverI/I ... lcome.html
PDF downloadable version:
http://www.geo.mtu.edu/~raman/SilverI/I ... ipBook.pdf
The two versions are actually quite different.
Isle Royale Geological Field Guide & Trip Report from 2013
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