Recent studies have demonstrated that in Illinois (1) the structural feature designated as the Kankakee arch is a broad monocline whose axis trends northwest-southeast across the northeast part of the State, with the steep limb to the southwest, and (2) the principal and most significant movement occurred between the depositions of the Shakopee dolomite and the St. Peter sandstone, with less important movements probable at several subsequent Paleozoic times. This knowledge adds an important item to the structural history of the region and clarifies the stratigraphic succession in northeastern Illinois.

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