Time, Cratons, and Voyageurs NP
Time, Cratons, and Voyageurs NP
Time, Cratons, and Voyageurs NP
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<strong>Voyageurs</strong> National ParkGeologic History• Early Proterozoic (~2.5 Ga)– Evidence for early tectonics• Kenoran Orogeny – earliestrecognized in US– Metamorphic Rocks» Gneiss (forms at ~10miles depth)» Greenstone belts