Giant cross-beds within Carboniferous fluvial channels in northern England contain three types of internal erosion surfaces: a) multiple convex upward surfaces, which may have been produced under steady state conditions by erosion in front of smaller superimposed bedforms; b) isolated convex upward surfaces with fine-grained drapes which are interpreted as a product of falling stage erosion with low stage deposition of fine-grained sediment; and c) concave upward surfaces, some of which may result from erosion of the slip face due to changes in the geometry of the leeside flow, but in others the large amount of sediment removed indicates substantial erosion which may have resulted from a shift in the position of the thalweg during falling or low stage.

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