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sited on an inlier of Devonian "Old Red" sandstones and silts. The outskirts of the city spread beyond the (inferred) limits of the outlier onto the surrounding metamorphic/ igneous complexes formed during the Dalradian period (approximately 480-600 million years ago) with sporadic areas of igneous Diorite granites to be found, such as that at the Rubislaw quarry which was used to build much of

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