"Geological Map of the Lake Superior Land District in the State of Michigan", U.S. Government

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 "Act to establish a new land District for the sale of mineral lands in the State of Michigan." Color code explanation upper right. A handsome map that is rarely offered.

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Condition: A

Fine coloring and dark impression. Backed with archival tissue. Some light offsetting from title and a little fold toning, still very good.