Abstract

In the Lake Superior region, dispersal patterns of Keweenawan, Jacobsville-Bayfield, and Cambrian sediments based on paleo-current data indicate the configuration of the Keweenawan basin during sedimentation. Structural trends in the basement complex are essentially parallel with (1) form lines of the basin, (2) isopach and structure contours of Keweenawan rocks, (3) post-Keweenawan structural features, and (4) the present topographic basin of Lake Superior. This suggests that, since Huronian time, resurgent tectonic activity has controlled the development of the Keweenawan basin, sediment dispersal patterns, and post-Keweenawan structures.

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