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The mid-Cretaceous (Albian-Cenomanian) boundary in the central United States traditionally is placed at a major unconformity that records a withdrawal of marine waters from the Western Interior Seaway. Although this unconformity can be located with reliability in many areas of western North America and the Gulf Coast, its placement along the eastern margin of the interior seaway is more problematical. Largely as a matter of convenience, unconstrained by biostratigraphic data, the base of Cenomanian strata has been placed at the base of the sandstones of the Dakota Formation in its type area of eastern Nebraska and western Iowa, where they...

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