Triassic Sandstone/Marros Group separation map

Triassic sandstone/Marros Group separation map

Area where aquifer and shale/clay are present	Around Bristol Just north of the Mendip Hills Note that for the purposes of drafting this separation map the maximum depth of the Triassic sandstone 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	Near Bristol: up to 1000 m North of the Mendips: in the range of 300 to 1000 m
Lithology of intervening strata	Mixed permeability Pennine Coal Measures Group (mudstone, siltstone and sandstone)
Other major aquifers in the area	Carboniferous limestone (below)
Other shales or clays in the area	None
Aquifer map	Triassic sandstone principal aquifer
Shale/clay map	Marros Group shale/clay unit