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Three basement-cored anticlines in the southern Bridger Range and Canyon Mountain anticline and Squaw Creek fault in the northern Gallatin Range were analyzed by comparing foliations, mesoscopic faults, and slickenside lineations in basement rocks to Laramide structures in Phanerozoic cover strata. In regions where the pre-Laramide angle of discordance between Archean metamorphic foliation and bedding in Phanerozoic cover rocks was low, less than 25° (Bridger Range anticlines and at Canyon Mountain anticline), the basement was rotated congruently with cover strata during Laramide folding. This was accomplished by localized flexural slip on basement foliation surfaces. However, the more commonly observed style...

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