Sheets of anhydrite, up to 5 cm thick, occur abundantly in southeastern Saskatchewan within dolomitized Mississippian carbonates where these are unconformably overlain by Watrous red beds. The sheets are interpreted as former gypsum veins that have lost structural water as a result of later burial. Replacement by anhydrite was accompanied by no loss of volume and the fibrous vein structure of the former gypsum is partially mimicked by the anhydrite.Gypsum veining is believed to have occurred as a result of the migration of calcium sulphate-rich brines through the Mississippian carbonates after the deposition of the Watrous red beds.

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