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The Quarterly journal of the Geological Society of London . SHARPE ON SLATY CLEAVAGE ' Skiddaw slate Trap Skiddaw slate Trap BO lc KM ' ro erpendicular CP iU Uldale Axis of eleva tion Green slate Green slate Green slate Keswick ' crq ' Slate quarrj'c Watendlath Vi Page Illustration biodiversitylibrary