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The Gault Formation was deposited in the Cretaceous and crops out from East Anglia to west Dorset, and from north-east Kent to Sussex.
The Mercia Mudstone Group was deposited in the Triassic and underlies much of central and southern England.
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This theme provides information on zones of rock strength and the local factors controlling it, as part of a suite of GIS layers for different engineering parameters.
Deposition is the laying down of sediment carried by wind, water, or ice.
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