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Cefn Gwyngul
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Cefn Gwyngul : ウィキペディア英語版
Cefn Gwyngul

Cefn Gwyngul is a long broad ridge to the east of the Rhondda Fach valley in Rhondda Cynon Taf County Borough in South Wales. Its 470m high summit is marked by an ancient cairn known as Carn-y-Pigwn, on which is a more recent trig point. Much of the hill is cloaked by modern forestry plantations though its southwestern flank between Porth and Ferndale has not been coniferised. The earthworks of a Roman camp remain on the ridge at OS grid ref ST 002982.
== Geology ==
The hill lies at the heart of the South Wales Coalfield and is formed from relatively flat-lying sandstones of the Pennant Sandstone Formation assigned to the Warwickshire Group, laid down in the late Carboniferous Period. Numerous coal seams within these beds have been worked in the past and the legacy of coalmining is widespread. The important Brithdir and Brithdir Rider seams outcropped along the upper western flanks of the ridge.〔British Geological Survey 1:50,000 map sheet 248 ''Pontypridd'' & accompanying memoir〕〔(BGS ‘Geology of Britain’ viewer )〕

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