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The base of the Storøysundet Member is, by definition, coincident with the base of the Vik Formation. The basal stratotype displays 12.5 m of the member, but a total thickness of approximately 20 m in the type area of the Vik Formation is suggested by other coastal exposures around Storøysundet (NM6958). The red shales of the Storøysundet, Member contain minor bioclastic limestone lenses, small calcareous nodules and occasional greenish grey shale interbeds. A diverse but sparse fauna includes crinoids, brachiopods, stromatoporoids and tabulate corals.