Abstract

Bedding structures of a well-exposed section across a channel bar in Ganga River near Allahabad are studied. The channel bar, composed of moderate to well sorted sands, is marked by the absence of larger bed forms such as megaripples. The bar succession is composed of mainly low-angle cross-bedding, produced by active lateral shifting of the lee-face of the bar, and scour and fill cross-bedding produced of scouring and quick deposition from fluctuating, turbulent currents. The low-angle cross-bedding is rather similar to beach bar cross-bedding. Importance of such successions in the environmental reconstruction of the ancient sediments is discussed.

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