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The white rock is Cambrian quartzite, which here outcrops in a band E of Beinn a' Bhutha's summit. The rounded hill beyond is Ben Hee, composed of Moine series rocks. Unravelling the geology of this area has taken a long time; a simplified geological map is available with the guide 'Exploring the landscape of Assynt' published by the British Geological Survey and available at the Inchnadamph Field Centre.