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Journal of the Geological Society; October 1996; v. 153; no. 5; p. 661-664; DOI: 10.1144/gsjgs.153.5.0661
© 1996 Geological Society of London
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Article

Sediment recycling on Siluro-Devonian floodplains

S. B. MARRIOTT1 and V. P. WRIGHT2

1 Faculty of the Built Environment, University of the West of England, Coldharbour Lane, Bristol, BS16 IQY, UK
2 Postgraduate Research Institute for Sedimentology, The University of Reading, PO Box 227, Whiteknights, Reading, RG6 6AB, UK

Some of the red mudstones in the Red Mark (Old Red Sandstone) of Llansteffan, Dyfed, are interpreted as originating as sand-sized mud aggregates (pellets) produced in soils and deposited from bed load in small sinuous channels. By analogy with the Channel Country of Australia such channels may represent periods of low discharge and reduced hydraulic efficiency when the floodplains were locally reworked. In contrast, larger channel-fills, with extraneous sediments, may represent pluvial periods with increased discharge.

KEYWORDS: Old Red Sandstone, South Wales, soils, pellets, bed load




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