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Detailed mapping of a syn-orogenic intrusion and the surrounding rocks provides supporting evidence in favour of a recent re-interpretation of the stratigraphy of the Trondheim Nappe Complex (Sturt et.al.1994) The Tron intrusion lies within rocks of the Hummelfjell group. The preservation of folds within recry- stallised hornfels close to the intrusion confirms the presence of an old tectono-metamorphic event in these rocks.