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The lower Precambrian granulite-facies gneisses near Granite Falls and Montevideo have undergone four phases of folding, two periods of metamorphism, and both pretectonic and posttectonic intrusive events. Rare F1 folds occur only in thin quartzofeldspathic veins that are at a high angle to the pervasive S1 foliation and banding in the gneisses and that formed during the generation of S1. The F2 folding generated the most prominent structural features in the area—a large-scale, gently plunging antiform near Granite Falls and an inferred synform between Granite Falls and Montevideo. The F3 and F4 fold...

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