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Discusses the conditions of the linear sand banks in the southern North Sea considered to have large-scale mobile bed forms in dynamic equilibrium. Movement of sand streams in opposing directions of either side of the bank; Accumulation of sand which is believed to result in continuing the growth of the bank parallel to the direction of flow of the tidal currents.

Presents cross-bedding data measured in a marine sand for which the environment of deposition, age, geometry and local extent are known. Data suggesting that the wave path, topography of the depositional surface and local rates of subsidence varying during deposition of the cross-bedded sand resulting in a uniform distribution of the cross-bedding sets.