1. Ordovician conodonts from the Bulltinden Formation, Motalafjella, central-western Spitsbergen
2. Barker, A.J. & Gayer, R.A. 1985. Caledonide‐Appalachian tectonic analysis and the evolution of related oceans. In: Gayer, A.R. (ed) . The tectonic evolution of the Caledonide‐Appalachian Orogen. Vieweg, Wieswaden127-165.
3. Barnes, C.R. , Norford, B.S. & Skevington, D. 1981. The Ordovician System in Canada. Correlation chart and explanatory notes. International Union of Geological Sciences Special Publication. 8.
4. Caledonian thrusting on Bj rn ya: Implications for Palaeozoic and Mesozoic tectonism of the western Barents Shelf