Crag/Kimmeridge Clay and Ampthill Clay formations separation map

Area where aquifer and shale/clay are present	North central Norfolk
Thickness of intervening strata	300 to 450 m
Lithology of intervening strata	Permeable Lower Greensand Group (principal aquifer) Mixed permeability Upper Greensand Formation and Gault Formation (shale) Permeable Chalk Group (principal aquifer)
Other major aquifers in the area	Oolites (below) Triassic sandstone (below) Carboniferous limestone (below)
Other shales or clays in the area	Kellaways Formation (below) Oxford Clay Formation (below) Osgodby Formation (below) Lias Group (below)
Aquifer map	Crag principal aquifer
Shale/clay map	Kimmeridge Clay and Ampthill Clay formations shale/clay unit

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