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Granitoid orthogneisses make up the predominant rock type in the West Sudetes from JizerskØ hory in the NW to the OrlickØ hory and Sne Ï z Ïník Mountains in the SE. These generally strongly foliated gneisses are calc-alkaline in composition and display trace element characteristics suggesting generation in a volcanic arc setting. Single zircon ages reflecting the time of emplacement of the gneiss protoliths define a relatively narrow Cambro-Ordovician range between 502 and 515 Ma.