1. Location and Rock Type of
UK Aquifers
The London aquifer is shown by the
red box
The chalk is the aquifer reservoir rock
which outcrops at the N and S Downs
This is also its zone of recharge at the
unconfined part of the aquifer.
The aquifer underneath London is
confined by the impermeable London Clay
of Palaeogene / Neogene age above.
An aquiclude exists below the chalk and
is made of the impermeable mudstone
of the Gault Formation.

2. Geological Map London Aquifer

3. Geological Cross Section of London Aquifer

4. Geological Cross Section of London Aquifer:
Simplified Geological Cross Section of London Aquifer:
London Clay
(Impermeable)
Chalk
(Permeable)
Aquifer
Syncline Fold Axis
Confining Bed
Gault Clay / Mudstone
(Impermeable)
Aquiclude

5. London Aquifer is therefore similar to this diagram:
R. Thames
Chalk
London Clay
North Downs
South Downs
Gault Mudstone / Clay