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Geology of Suffolk : ウィキペディア英語版 | Geology of Suffolk The geology of Suffolk in eastern England largely consists of a rolling chalk plain overlain in the east by Neogene clays, sands and gravels and isolated areas of Palaeocene sands.〔British Geological Survey 1:50,000 scale geological map series sheets (England and Wales) 173 -176, 188 -191, 205 -208 & 223 - 225 and accompanying memoirs〕〔British Geological Survey 1:625,000 scale geological map ''Bedrock Geology UK South'' 5th Edn. NERC 2007〕 A variety of superficial deposits originating in the last couple of million years overlie this 'solid geology'. == Cretaceous == The oldest rocks exposed at the surface in Suffolk are the mudstones and sandstones of the Gault and Upper Greensand formations which are to be found only in the extreme northwest of the county west of Lakenheath. Overlying these deposits and to their east are the rocks of the Chalk which are divided into the lower i.e. older Grey Chalk and the upper i.e. younger White Chalk.
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