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Bedrock geologic map of the Greenwood quadrangle, Marquette County, Michigan
William F. Cannon
1974, Geologic Quadrangle 1168
The Marquette Iron Range is presently ( 1973) the second largest iron mining district in the United States. Commercial iron deposits, now mostly concentrating-grade ore, are in the Negaunee Iron-formation, which is part of a thick sequence of metasedimentary rocks of Precambrian X age. These rocks are preserved in the...