A striking map showing the geology of Upper Michigan Peninsula, Isle Royale and the north shore of Lake Superior. Indicates copper, iron, silver, marble furnaces, iron forages and active/inactive mines. Prepared by J.W. Foster & J.D. Whitney pursuant to an Act of Congress approved March 1, 1847 entitled an "Act to establish a new land District for the sale of mineral lands in the State of Michigan." Color code explanation upper right.

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Condition: B

Fine coloring and dark impression. Issued folding, now pressed and backed with archival tissue. Light text offsetting in blank area and a little fold toning. Closed puncture in blank area near legend, else very good.