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Iron Formations
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From Meyers and Miller, 2008.
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BIFs formed at the same time world wide.
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BIFs http://www.geo.umn.edu/people/grads/bair0042/BIFs.jpg
Banded iron formation, iron and chert layers
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Crusted plates collided and made the Great Lakes Tectonic Zone, which is still mildly active (still is possible to produce earthquakes).
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Wait. Exam your bifs… what do you notice
Wait! Exam your bifs… what do you notice? …about their relative weight …are they magnetic?
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Gravity Map, The iron formations are found by surveying the strength of the gravity and magnetic fields throughout Minnesota. Iron is more dense and magnetic than the surrounding layers.
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