Spilsby Sandstone/Lias separation map

Area where aquifer and shale/clay are present	East Lincolnshire
Thickness of intervening strata	About 330 to 500 m
Lithology of intervening strata	Permeable Great Oolite Group and Inferior Oolite Group (principal aquifer) Low permeability Kellaways Formation; low permeability Oxford Clay Formation; low permeability Osgodby Formation; low permeability Kimmeridge Clay Formation (clay); low permeability Ampthill Clay Formation (clay)
Other major aquifers in the area	Chalk; Lower Greensand (both above) Triassic sandstone; Magnesian limestone; Carboniferous limestone (all below)
Other shales or clays in the area	Bowland Shale Formation; Craven Group (both below)
Aquifer map	Spilsby Sandstone principal aquifer
Shale/clay map	Lias shale/clay unit

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