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  Article

  	The North American Tapestry of Time and Terrain

        Michigan Basin

  	Close-up of the Michigan Basin
A giant incomplete bull's-eye is centered on the state of Michigan.
Radiating outward to Ohio, Indiana, Illinois, Wisconsin, and Ontario,
this annular pattern outlines the Michigan Basin. The Basin is a
bowl-shaped structure of uncertain origin that contains over 2.5 miles
(4 km) of inward-dipping Paleozoic <../legend/ages/paleozoic.html>
strata and a veneer of Jurassic <../legend/ages/jurassic.html>
sedimentary <../types/sedimentary.html> rocks. This curious basin is
located in the less tectonically-active interior of the continent,
bordered by the Appalachian and Rocky Mountains. It subsided rapidly
from Cambrian <../legend/ages/cambrian.html> to Silurian
<../legend/ages/silurian.html> time and filled with shallow-water marine
sediments, some of which contain deposits of petroleum, coal, and salt.