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The upper Abborvika Member consists of greenish grey to red shales with interbedded finely nodular limestones. A sparse fauna of crinoids, cephalopods and brachiopods is seen. The member is estimated to be 35 m thick in its stratotype on Purkøya (NM688571); the base is defined by the transition from the abundant limestones of the underlying unit into greyish green calcareous shales with sparse evenly bedded and calcareous nodular horizons. These beds pass up into red shales with irregular very finely nodular horizons about 18 m above the base of the member. The upper 3 m of the member consist of greenish grey shales; these are sharply overlain by siltstones of the Bruflat Formation and the junction is well exposed on Purkøya (Fig. 12b).