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Upper Peninsula of Michigan / Nonesuch Shale / Geology of Minnesota / Porcupine Mountains / Presque Isle River / Lake Superior / Sedimentary rock / Presque Isle / Midcontinent Rift System / Geography of Michigan / Geology / Geography of the United States


Geology of the Porcupine Mountains The bedrock of the Porcupine Mountains records part of the evolution
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Document Date: 2003-05-27 10:24:25

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