Abstract

The early Silurian griestoniensis Zone turbidite system developed in the ensialic, tectonically active Welsh Basin. The preserved remnants of the system are interpreted as deposits of the largely unchannelled outer region of a moderately large, high-efficiency, confined turbidite system with a minimum length of 100 km. Large-scale conglomerate and sandstone-filled erosional structures are present in the most proximal areas of exposure. Palaeocurrent patterns and inferred onlap relationships reflect strong lateral confinement by structurally controlled slopes. Growth of the system appears to have been essentially aggradational and vertical stacking of lobe sandstone packets is ascribed to pulses of rapid tectonic uplift at source. The sediment source was probably a large delta located on the uplifting southern basin margin.

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