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The Quarterly journal of the Geological Society of London . HARKNESS AND NICHOLSON ON THE STRATA BETWEEN Fig Diagram showing the vertical Succession of the Silurian Strata in Slelgill BecJc near Ambleside Base of the Coniston Flags Broughton Moor Flags with Monograpfus colo nics Retiolites Geinitzianus Knock beds Greenish