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which are not ore-bearing deposits in this area, and the lack of significant alluvial fans at either end of the gutter which would be present given the amount of water needed to be released to create the gorge in the first place. The gutter cuts through the Stainmore Formation and has "a bed of millerite-bearing clay ironstone nodules unique within the Northern Pennines and an abundance of unusual quartz-rich ironstone septarian nodules which are the source

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