Clay forming an extensive layer in SE England, dating from the lower Eocene period.
- Residents in Southend, Westcliff and Leigh are likely to be hit particularly hard because the soil is predominantly London clay.
- Colchester in Essex, where London clay underlies the estuaries, was the home of the renowned Pyfleet oysters.
- For cooling the building during warm weather, naturally chilled groundwater is brought up from the aquifer through holes bored through 410 feet of London clay.
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Line breaks: Lon¦don clay
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