Using GPR to extract 3-D turbidite channel architectures from the Upper Carboniferous Ross Formation, County Clare, Westen Ireland. 1: geological setting; 2: outcrop data integration (original) (raw)

Abstract

The Upper Carboniferous (Namurian) Ross Formation represents a thick accumulation of sandstones and shales forming the early fill of the West Irish Namurian Basin (Collinson, 1991). The basin shows a systematic progradational fill from basinal shales (Clare Shales) to deep-water shales and turbidites (Ross Formation) to unstable slope deposits (Gull Island Formation) and shallow-water upward-coarsening deltaic sequences (Clare Group). The Ross Formation is very well exposed in coastal sections around the Loop Head peninsula. Here, the formation is 380m thick and consists of 75% sandstone, but rapidly thins to the North and South. The sandstone depositional units consist predominantly of sheet-like turbidites formed within laterally extensive layered or amalgamated sand-rich units (Clark, 1998). Inter-bedded within these sheet sandstones are erosional, small-scale channels, typically 100 to 500 metres wide and 5 to 15 metres deep.

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