Corallian limestone/Bowland Shale Formation and Craven Group separation map

Area where aquifer and shale/clay are present	Southern side of Vale of Pickering (Malton to Bridlington) Note that, for the purposes of drafting this separation map, the maximum depth of the Corallian 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	About 2000 to 3000 m
Lithology of intervening strata	Mixed permeability Millstone Grit Group and Pennine Coal Measures Group (mudstones, siltstones and sandstones) Permeable Magnesian limestone (principal aquifer) Permeable Triassic sandstone (principal aquifer) Low permeability Mercia Mudstone Group Low permeability Lias Group (clay) Permeable Ravenscar Group Low permeability Kellaways Formation, Oxford Clay Formation and Osgodby Formation (clay)
Other major aquifers in the area	Chalk (above)
Other shales or clays in the area	Kimmeridge Clay Formation and Ampthill Clay Formation (above)
Aquifer map	Corallian limestone principal aquifer
Shale/clay map	Bowland Shale Formation and Craven Group shale/clay unit

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