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Journal of the Geological Society; 1995; v. 152; issue.3; p. 481-485;
DOI: 10.1144/gsjgs.152.3.0481
© 1995 Geological Society of London

Article

Are enigmatic erosional sandy wave-like bedforms in Jurassic Bridport Sands, Dorset, due to standing waves?

K. T. PICKERING

Department of Geological Sciences, University College London, Gower Street, London WC1E 6BT, UK

A field of sandwave-like bedforms produced by erosion, rather than deposition-with-bedload traction, is identified within the Lower-Middle Jurassic shallow-marine Bridport Sands of the Wessex Basin, which were previously interpreted as simple channel-like erosional scours by Davies in 1967. Here, this interpretation is refined by proposing that these sandy bedforms formed as near-symmetrical scours into horizontally-stratified and bioturbated very fine- to fine-grained sands in shallow water below standing waves, possibly internal edgewaves. These sandy bedforms, and contemporaneous erosional surface which defines the base of the Ham Hill Stone, may represent different responses to a mooreiSubzone lowstand of sea level.


Keywords: Jurassic, standing waves, edgewaves, shallow-water environment, storms.