Suggestions are made for correlation of Cambrian penetrated in the deeper wells in Kentucky with the outcrop on the Ozark uplift and with the sections on the north. Thickness maps indicate (1) the overlap of older Knox formations by younger members of the Chazyan on the north, and (2) the unconformity at the top of the Cincinnatian with loss of younger formations toward the Ozark uplift.

Facies maps are used to indicate lithologic changes through the major divisions of the Ordovician. The pattern of these facies suggests that an extended Ozark uplift was source for much of the clastic sediments from Chazy to the close of the Cincinnatian. A sub-Cretaceous areal geologic map is presented to show the probable extent of the old uplift.

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