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Geology of the Biwabik Iron Formation and Duluth Complex.
Regul Toxicol Pharmacol
October 2008
Minnesota Geological Survey, 2642 University Ave., St. Paul, MN 55114, USA.
The Biwabik Iron Formation is a approximately 1.9 billion year-old sequence of iron-rich sedimentary rocks that was metamorphosed at its eastern-most extent by approximately 1.1 billion year-old intrusions of the Duluth Complex.
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