Oolites/Bowland Shale Formation and Craven Group separation map

Area where aquifer and shale/clay are present	Around the Humber Lincolnshire North-east Leicestershire Note that for the purposes of drafting this separation map the maximum depth of the Oolites 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	Around the Humber and northern Lincolnshire: about 1500 to 3000 m Around south-west Lincolnshire and north-east Leicestershire: about 500 to 1500 m
Lithology of intervening strata	Mixed permeability Millstone Grit and Coal Measures (mudstones, siltstones and sandstones) Permeable Magnesian limestone (principal aquifer) Permeable Triassic sandstone (principal aquifer) Low permeability Mercia Mudstone Group Low permeability Lias Group (clay)
Other major aquifers in the area	Chalk; Lower Greensand; Spilsby Sandstone (all above) Carboniferous limestone (all below)
Other shales or clays in the area	Kimmeridge Clay Formation; Ampthill Clay Formation; Kellaways Formation; Oxford Clay Formation; Osgodby Formation (all above)
Aquifer map	Oolites principal aquifer
Shale/clay map	Bowland Shale Formation and Craven Group shale/clay unit

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