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The occurrence of groundwater in the Lower Palaeozoic rocks of upland Central Wales
groundwater upland Central Wales Lower Palaeozoic rocks
2009/6/8
A series of boreholes of up to 50 m depth, drilled into Lower Palaeozoic mudstone, shale and greywacke bedrock in the headwater catchment areas of the River Severn at Plynlimon in Central Wales, show...