Nine facies comprise the Swope and Dennis Formations of Missouri and Iowa. These include five varieties of biomicrites and one each of micrite, biosparite, biolithite, and oolitic-intraclast facies. The majority of carbonates are calcitic, and recrystallization to coarse mosaic is widespread. Overlap of facies shows transgression of 70 to 110 mi. Shale seams mark the boundary between each cycle. Depth of water was major controlling factor over facies arrangement. Terrigenous mud contributed to differentiation of facies.

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