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A substantial section of Precambrian rock is exposed over an area of approximately 19,400 km2 (7,500 mi2) in the western part of the Northern Peninsula of Michigan. This province is a portion of the exposed southern terminus of the Canadian Precambrian Shield and contains a large variety of igneous, sedimentary, and metamorphic rocks. Significant amounts of iron and copper from Precambrian rocks of Michigan have provided important contributions to the growth of the state and national economy for nearly 150 years.

Archean rocks consist of volcanics, sediments, and younger felsic and mafic intrusives, some of batholitic dimensions....

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