Cambrian and Ordovician fossils from the Hardangervidda Group, Haukelifjell, southern Norway

New finds of trilobites and brachiopods are described from two horizons in the autochthonous/parautoch­ thonous Hardangervidda Group. The occurrence of the trilobites Lejopyge armata (Linnarsson) and Andrarina costata (Angelin) indicates, for the first time, a late mid-Cambrian (Lejopyge /aevigata Zone) age for part of the 'Alum Shale' (Bjorno Member of the Laven Formation) on Hardangervidda. Brachiopods from the younger Bjornaskalle Formation include orthides, a clitambonitide and Antigon­ ambonites of the p/anus species group of Opik and are indicative of a late Arenigearly Llanvirn age. Both faunas indicate the most westerly known extension of Cambrian and Ordovician rocks on the Baltic platform. But whilst the uniformity of the 'Alum Shale' facies across the platform is confirmed, the upper Arenig-lower Llanvirn rocks differ from coeval strata elsewhere in the autochthon.