This article contains a discussion of the regional stratigraphic changes as revealed from studies of outcrops and cuttings from approximately 525 wells in the following states: Michigan, Ohio, Indiana, Illinois, Kentucky, and Tennessee. Three west-east cross sections have been prepared in order to show graphically these structural and stratigraphic changes. A tentative correlation table and seven logs made from studies of well cuttings are included as an aid to future students in the area.

The structural history which began in pre-Cambrian time, continued with minor pulsations in post-Canadian, post-St. Peter, post-Brassfield, post-Chattanooga, post-St. Genevieve, and post-Pennsylvanian time. One major period of folding occurred in post-Mississippian pre-Pennsylvanian time.

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