The largest landslides on the south coast of England are those associated with failure surfaces in montmorillonite- rich mudstones close to the base of the Gault Formation (mid Cretaceous). Those at Folkestone, Sussex (Trenter & Warren 1996), Ventnor, Isle of Wight (Hutchinson 2001) and Black Ven, west Dorset (Brunsden 2002) are among the largest active landslide systems in the UK. Westwards from Dorset, the Gault facies of the Albian Stage is replaced on the east Devon coast by sandstones and sandy calcarenites of the Upper Greensand Formation. These are mostly moderately strong rocks that...

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