Abstract

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.

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