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High-resolution aeromagnetic data recently acquired over northeastern and east-central Minnesota are useful in interpreting the Archean and Proterozoic bedrock beneath a widespread mantle of Pleistocene glacial materials. The new aeromagnetic data, gathered at a 400-m line spacing and a 150-m ground clearance, allow a much improved structural interpretation of many Archean and Proterozoic features, including the Archean migmatitic rocks of the Vermilion Granitic Complex, the Vermilion fault zone, the Keweenawan (Middle Proterozoic) lavas on the St. Croix horst, and the Keweenawan Duluth Complex. The data have delineated two poorly exposed dike swarms, one of Early Proterozoic age striking northwest...

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