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The Norwood Ridge 〔http://www.croydononline.org/history/topics/geology2.asp〕 is a landmark ridge in South London approximately five miles south of central London. It runs for approximately three miles in a north-easterly direction, from Selhurst and Streatham in the south, to Forest Hill in the north. It is a ridge of London Clay capped in places with gravel deposits known as the Claygate Beds.〔''Sheet 270 South London'', 1:50,000 Geology Series, British Geological Survey, Keyworth, 1998, ISBN 0-7518-3206-5〕 It includes Sydenham Hill and Crystal Palace and also parts of Dulwich and Upper Norwood. The upper parts of the ridge average a little above , offering views across London. The northern slopes feed the River Effra, and the southern slopes the Pool River. It is the location of two prominent transmitting towers, Crystal Palace transmitting station and Croydon transmitting station. To the south, lower layers of the London Clay and Palaeocene deposits lie between the ridge and the dip slope of the North Downs. The area has in the past had brick fields and has many railway tunnels. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Norwood Ridge」の詳細全文を読む スポンサード リンク
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