Abstract
The well-defined trench of the Mississippi River between St. Louis and Cape Girardeau roughly contours the eastern slope of the Ozark topographic dome instead of following the lowland farther east in Illinois. This relationship is believed to result from upwarping of the dome after the river had assumed essentially its present course in other words, the Mississippi is thought to be antecedent to the warping. Strath-terrace remnants in tributary streams indicate two movements separated by a time of quiescence. Evidence now available does not date the warping closely. The movements appear to have been post-Wilcox and preglacial.
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