The Michigan Basin. The Union of Geology and Topography. USGS. A giant incomplete bulls-eye is centered on the state of Michigan. Extending into Illinois, Ohio, Indiana, Wisconsin, and Ontario, this annular pattern outlines the Michigan Basin, a bowl-shaped structure of uncertain origin that contains over 4 km of inward-dipping Paleozoic strata and a veneer of Jurassic sedimentary rocks. This mysterious basin is located in the tectonically less active interior of the continent.