Mixed siliciclastic-carbonate system of the middle member of the Bakken Formation, Williston Basin, North Dakota
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The Middle Member of the Bakken Formation (MM-BF) is a mixed siliciclastic-carbonate unit deposited in the shallow, epeiric shelf setting of the Williston Basin during the Famennian-Tournaisian Transgression. The MM-BF in North Dakota consists of six distinct units (MB-A to F) but primarily can be divided into: (1) lower variably calcareous dolomitic siltstone, (2) middle calcareous grainstone-sandstone, (3) and upper argillaceous dolomitic siltstone. Stratigraphic analysis of subsurface core reveals that the lower siltstone unit (MB-A, B, & C) was deposited in a tide-dominated, wave-influenced ...