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Pacific Coastal and Marine Science Center

Bedform Sedimentology Site: “Bedforms and Cross-Bedding in Animation”

Cross-Bedding, Bedforms, and Paleocurrents


Photo of rock or sand showing pertinent structure or structures; see caption below.

FIG. 49. Tidal bedforms with lee-side spurs, Loughor Estuary, South Wales, photographed by Trevor Elliott. Elliott and Gardiner (1981) interpreted these lee-side spurs to be the result of unsteady flow. Helical flow in the lee of the main bedform, inferred to have been caused by a change in flow direction at falling stage, was believed to have created the spurs.  Alternatively, flow unsteadiness may not have been necessary to create the bedforms and the spurs (Fig. 48).  Trowel is 0.28 m long.


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