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Keywords from Image Description:
The Quarterly journal of the Geological Society of London . PROCEEDINGS OF THE GEOLOGICAL SOCIETY Nov 'aWI Perpendicular Perpendicular Cleavage faint Roofingslate Cleavage faint Perpendicular Perpendicular Perpendicular pi ' fa Porphpy Slate Bedding obscure Slate crystalline Greenside Glenridding Whiteside