Abstract
The Okaw division of the Chester (late Mississippian) series of southwestern Illinois which heretofore has been considered middle Chester in age, is shown to be separated into two mapable parts by a disconformity. The lower unit, Lower Okaw, is of middle Chester age and the higher portion, Upper Okaw, is of late Chester age. Each of these units is described and correlated on paleontologic, lithologic, and stratigraphie grounds with a definite portion of the standard Chester section of Hardin County, Illinois, and western Kentucky.
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