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The oil-sands reservoir related to the Long Lake South (LLS) project is contained within the McMurray formation, which is the basal unit of the Lower Cretaceous Mannville Group. The McMurray formation directly overlies the sub-Cretaceous unconformity, which is developed on Paleozoic carbonates of the Beaver Hill Lake Group and is overlain by the Wabiskaw, Clearwater, and Grand Rapids Formations of the Mannville Group.

The study area (Figure 1) is located along the axis of the McMurray Valley system, which was localized by the dissolution of underlying Devonian evaporates, creating the preferred depositional fairway for the Lower Cretaceous McMurray sediments....

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