Entire Ordovician Red River Formation of the central Williston Basin was deposited in subtidal "brining-upward" sequences. Dozens of dolomite pods formed by subtidal downward migration of magnesium-rich brines. Because certain layers of the carbonates were quite permeable to the dolomitizing brines, highly irregular reservoirs characterized by interfingering limestones and dolomites formed.--Modified journal abstract.

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