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Cefn Eglwysilan : ウィキペディア英語版 | Cefn Eglwysilan
Cefn Eglwysilan is a hill in South Wales, the twin 382m summits of which lie 2 km east of Pontypridd in Rhondda Cynon Taf county borough. Its eastern side lies within the community of Aber Valley in Caerphilly county borough. Like neighbouring Mynydd Eglwysilan, the hill is named after the hamlet of Eglwysilan, the church here being dedicated to an obscure saint Ilan. A wireless transmission station is sited on the more northerly of the two summits (at OS grid ref ST 099911). The southerly one is crowned by a trig point. == Geology == The hill is formed from the Hughes Sandstone (formally the ‘Hughes Member’ and formerly the ‘Hughes Beds’) of the Pennant Sandstone Formation laid down late in the Carboniferous Period (c 309-306 million years ago). Siltstones and mudstones appear beneath the main upper bed of sandstone.〔British Geological Survey 1:50,000 map sheet 249 ''Newport'' & accompanying memoir〕〔(BGS ‘Geology of Britain’ viewer )〕
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