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BTChronostratigraphic Units
 .Precambrian
 ..Animikie Group
RTOntario
 Wisconsin
 Minnesota
 Biwabik Iron Formation
 Gunflint Iron Formation
 Michigan
 Thomson Formation
 Virginia Formation
SNIncludes Pokegama Quartzite, Biwabik Iron Formation Series, and Virginia Formation, N Michigan, NE Minnesota, Ontario, and N Wisconsin.