Corallian limestone/Kellaways, Oxford Clay and Osgodby formations separation map

Area where aquifer and shale/clay are present	North Yorkshire Southern England 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	0 m
Lithology of intervening strata	No intervening strata; units are contiguous
Other major aquifers in the area	North Yorkshire: Chalk (above); Triassic sandstones; Magnesian limestone (both below) Southern England: Chalk; Lower Greensand (both above); Oolites; Triassic sandstone; Permian sandstone; Carboniferous limestone (all below)
Other shales or clays in the area	North Yorkshire: Kimmeridge Clay Formation; Ampthill Clay Formation; Lias Group; Bowland Shale Formation; Craven Group (all below) Southern England: Kimmeridge Clay Formation; Ampthill Clay Formation (both above); Lias Group (below)
Aquifer map	Corallian limestone principal aquifer
Shale/clay map	Kellaways, Oxford Clay and Osgodby formations shale/clay unit

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