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13 October 2011

Superior Craton trip, stop 1

The first stop on our pre-GSA field trip to the subprovince boundaries of the Superior Craton was a place just north of Virginia, Minnesota, where the Mesabi Iron Ranges are mined (same Proterozoic banded iron formations that were portrayed as the backdrop of the mining activity depicted in the film North Country). The pull-off is locally known (to geologists) as “Confusion Hill,” but marked on the roadside sign as the …


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