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The historic type area of the Dakota Formation lies along the Missouri and Big Sioux River Valleys in northeast Nebraska and northwest Iowa, in the eastern margin area of the Western Interior Province. The type Dakota sequence is characterized to provide a basis of comparison with supposed “Dakota” sections elsewhere in the Western Interior. The general sequence includes (1) a lower sandstone-dominated Nishnabotna Member with coarse-grained and conglomeratic facies, and (2) an upper mudstone-dominated Woodbury Member with sandstone channel bodies and lignites. The depositional sequence is interpreted to record, in ascending order: (1) aggradation of coarse-grained braided and proximal meanderbelt...

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