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The Ozark Uplift and Midcontinent Silurian and Devonian Stratigraphy
The Ozark Uplift is pictured as being a north-south oriented, tectonically active rectangular block which during Silurian and Devonian time was tilted to the northwest. Silurian sediments were deposited around the raised southeast corner of the block, but through the unified rise of the block and the Chautauqua Arch to the west the block was joined to the Transcontinental Arch. This latter arch, together with the Wisconsin Dome and Kankakee Arch, formed with the Chautauqua Arch and Ozark Uplift a topographic assembly of uplifts and basins that prevailed throughout Devonian time in the Midcontinent area west of the Cincinnati Arch and northwest of the Nashville Dome. South of this assembly, there existed the Ouachita Trough which was later largely deformed by compression from the south. The basins, flanked and enclosed by the arches and uplifts, collected the sediments poured into them from the various sources within and outside the assembly. Silurian and Early Devonian clastic sediments apparently were derived from sources east and south of the assembly while the uplifts within the assembly contributed carbonate solutions. In Middle Devonian time clastic material was derived from source rock largely within the assembly. Epeirogenic movement and tilting of the assembly region throughout the two periods controlled distribution of the sediments in the basins, thus accounting for the uniform distribution of Silurian rock, the absence of Lower Devonian rock in the northern part, and the absence of Middle Devonian rock in the southern part.
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