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The middle 13 m of the Garntangen Member are exposed in the E68 road section near Garntangen (NM720609) on the coast of Steinsfjorden. The member is also well exposed on the west coast of Storøya (NM690576 to NM694582) where its basal stratotype is defined. Its base is taken at the marked increase in limestone interbeds 3 m above the uppermost red shales of the underlying unit. The Garntangen Member is approximately 25 m thick and consists of thinly bedded limestones and calcareous nodules with minor greenish grey marls. Fresh exposures in the road section near Garntangen display 19 bentonitic horizons which vary from a few mm to 12 cm thick (Fig. 12a, see also Hagemann 1966). This part of the Vik Formation has a more rich and diverse fauna than the adjacent members and both corals and stromatoporoids are abundant; brachiopods (especially Pentamerus oblongus, Pentameroides cf. subrectus and Costistricklandia lirata) are also common in certain beds.