The Duluth Complex underlies an area of approximately 2,265 mi2 (6500 km2), but over much of its extent it is covered by glacial deposits. Some of the best and most representative exposures are in the city of Duluth. Several outcrops are described here along the Skyline Parkway, a well-marked scenic road near the top of the slope on which Duluth is built, facing the Lake Superior Basin. They are in the West Duluth, Duluth Heights, and Duluth 7½-minute Quadrangles. The first stop is adjacent to I-35 just southwest of Duluth (Fig. 1).
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One hundred field guides, with area maps, to locations in Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Nebraska, Ohio, and Wisconsin.