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Geology, Stratigraphic--Precambrian
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Geology, Stratigraphic--Proterozoic
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Porcupine Volcanics (Mich.)
Porcupine Volcanics (Mich.)
Geographic
sh92000555
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Broader Terms (2)
Formations (Geology)--Michigan
Geology, Stratigraphic--Proterozoic
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