The Otto Fiord Formation of Late Mississippian to Middle Pennsylvanian age is confined to the structural and depositional center of the Sverdrup Basin in the Canadian Arctic Archipelago. It is characterized by thick cycles of anhydrite, limestone, and sandstone in outcrop, and by a diapiric halite facies in the subsurface. The proposed deposi-tional model requires accumulation of carbonate sediments during transgression to a marine maximum, followed by precipitation and crystal growth of evaporites under hypersaline subaqueous conditions during regression. This interpretation thus differs from the currently popular “sabkha” model of anhydrite genesis.

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