Permian sandstone/Bowland Shale Formation and Craven Group separation map

Area where aquifer and shale/clay are present	West Lancashire Cheshire Basin Note that for the purposes of drafting this separation map the maximum depth of the Permian sandstone aquifer is taken to be 400 mbgl based on the recommendations in the UK TAG report. More information about this can be found in the methods section
Thickness of intervening strata	Up to 5000 m
Lithology of intervening strata	Mixed permeability Millstone Grit Group and Pennine Coal Measures Group (mudstone, siltstone and sandstone)
Other major aquifers in the area	Triassic sandstone (above) Carboniferous limestone (below)
Other shales or clays in the area	None
Aquifer map	Permian sandstone principal aquifer
Shale/clay map	Bowland Shale Formation and Craven Group shale/clay unit

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