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The base of the Steinsfjorden Formation at Loretangen is defined at the first occurrence of thinly interbedded limestones and shales which overlie the thickly bedded limestones of the Braksøya Formation. Olaussen (19 7 8) assigned the basal 200 m of the Steinsfjorden Formation to the Sjørvoll Member (9a‑d and lower 9e of Kiær 1908). This member consists of variably interbedded dolomitic limestones and limestones with red and greenish grey shales and marls. Mudflake conglomerates, desiccation cracks and algal laminated dolomitic limestone are common; the fauna shows a low diversity dominated by euryhaline elements often showing high individual abundance. A noteworthy eurypterid fauna Størmer 1934b, 1938) occurs together with algae (Høeg & Kiær 1926) in beds assigned to 9d by Kiær (1908).