The upper Hecla Hoek group of the Hecla Hoek succession in Ny Friesland, northeast Spitsbergen, is subdivided into the Polarisbreen and Oslobreen series. A fauna collected from the Oslobreen dolomites and limestones in 1956 is here described and the age range shown to be greater than previously suggested. The dolomites are, at least in part, lower Cambrian; the middle and most of the lower Oslobreen limestones are lower Ordovician. The fauna contains trilobites belonging to Hystricurus, Bolbocephalus, and Bathyurus, brachiopods belonging to Obolus and Archaeorthis, gastropods belonging to Macluritella and Helicotoma, and the cephalopod Salterella.

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