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Iron Formations. From Meyers and Miller, 2008. http://www.winona.edu/geology/MRW/mrwimages/bif_histo.gif. BIFs. http://www.geo.umn.edu/people/grads/bair0042/BIFs.jpg. http://www.winona.edu/geology/MRW/mrwimages/GLTZone.gif.
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BIFs http://www.geo.umn.edu/people/grads/bair0042/BIFs.jpg
Wait! Exam your bifs…what do you notice?…about their relative weight…are they magnetic?