Spilsby Sandstone/Bowland Shale Formation and Craven Group separation map

Area where aquifer and shale/clay are present	Central and east Lincolnshire
Thickness of intervening strata	About 2000 to 2750 m
Lithology of intervening strata	Mixed permeability Millstone Grit Group and Pennine Coal Measures Group (mudstone, siltstone and sandstone) Permeable Magnesian limestone (principal aquifer) Permeable Triassic sandstone (principal aquifer) Lias Group (clay) Permeable Great Oolite Group and Inferior Oolite Group (principal aquifer) Low permeability Kellaways Formation, Oxford Clay Formation and Osgodby Formation (clay) Low permeability Kimmeridge Clay Formation and Ampthill Clay Formation (clay)
Other major aquifers in the area	Chalk; Lower Greensand (both above) Carboniferous limestone (below)
Other shales or clays in the area	None
Aquifer map	Spilsby Sandstone principal aquifer
Shale/clay map	Bowland Shale Formation and Craven Group shale/clay unit

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