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Integrated surface and subsurface stratigraphic and sediraentologic analysis of the nonmarine Lower Cretaceous rocks along the eastern margin of the Rocky Mountain foreland demonstrates the crilical role of intrabasinal and cratonic deformation in controlling alluvial architecture in a distal foreland-basin setting.

Three coarse-grained intervals within the Lakota Formation can be recognized and correlated throughout the Black Hills and into the subsurface of the Powder River Basin. We informally designate these intervals from oldest to youngest as L1, L2 and L3. Detritus in the L1 interval was deposited in northward-flowing high-sinuosity rivers. The L2 interval lies atop of a regional...

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