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Walton and Ivythorn Hills
Walton and Ivythorn Hills is a biological Site of Special Scientific Interest near Street at the south-eastern end of the Polden Hills in the English county of Somerset. Walton Hill is south of the village of Walton, and Ivythorn Hill (sometimes spelled Ivy Thorn Hill) is south of Street. Notified in 1953, the site is now owned and managed by the National Trust who acquired the freehold in 1988.
The hills which rise to above Ordnance datum (mean sea level) are made up of limestone, rheatic clay and Keuper marl covered with calcareous grassland, scrubland and coppiced woodland. A quarry existed in the Middle Ages. This supports a variety of Butterflies, Leafhoppers, Spiders, Soldier Flies and Great Green Bush Crickets living on the vegetation. Notable buildings include Ivythorne Manor, which was originally built for Glastonbury Abbey, Walton windmill and a small sanatorium which became the first youth hostel in Somerset. In the 1970s a short lived hippie camp was set up on Ivythorne Hill.
==Geography==
The Polden Hills a long, low ridge, extending for , and separated from the Mendip Hills, to which they are nearly parallel, by a marshy tract, known as the Somerset Levels. The ridge is underlain by Blue Lias with alternating strata of limestone, rheatic clay and Keuper marl.〔
At the highest point on Walton Hill, which reaches above Ordnance datum (mean sea level),〔 there is a topograph or orientation stone used as a triangulation point and highlighting key features of the surrounding landscape including the Somerset Levels and the Admiral Hood Monument.〔(【引用サイトリンク】url=http://trigpointing.uk/trig/9460 )〕〔(【引用サイトリンク】url=http://www.mendip.gov.uk/CHttpHandler.ashx?id=1022&p=0 )〕 It forms the starting point for the long footpath known as the Polden Way.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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