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Three high-resolution seismic reflection profiles and two sub-bottom profiler sections acquired along the Mississippi River in southern-Central U.S. image deformation in post-Paleozoic sediments. The northernmost profile images two faults offsetting Cretaceous through at least Eocene Cane River reflectors, interpreted to strike northwest and to be part of the Arkansas River fault zone. The central profile shows a down-to-the-north fault, displacing Cretaceous and Paleocene Midway Group reflectors by ~210 m and ~160 m, respectively. The fault is interpreted as the northern edge fault of the Monroe Uplift, a Late Cretaceous uplift associated with igneous intrusions. The southernmost profile displays a down-to-the-south fault, offsetting Cretaceous and Paleocene-Eocene Wilcox Group reflectors by ~125 m and ~32 m, respectively. Tilted reflectors in the first 80 m indicate Eocene-Oligocene activity of the fault, although Quaternary activity cannot be ruled out. Quaternary tectonic activity is proposed for a series of faults that offset shallow ( |
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