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Carreg Dwfn : ウィキペディア英語版
Carreg Dwfn

Carreg Dwfn (also referred to as Careg Dwfn and Carregydwfn and referred to also as Careg-y-dwfan.〔Strahan, A. et al. 1907 ''The Geology of the South Wales Coalfield Part VII: the country around Ammanford' (memoir to sheet 230 of the Geological Survey) HMSO, London〕
) is a hill four miles southeast of Llandeilo and just to the south of the village of Trap in the county of Carmarthenshire, south Wales. It lies at the western extremity of the Brecon Beacons National Park and Fforest Fawr Geopark. Its summit at is towards the eastern end of a rocky east-west-aligned ridge.〔Ordnance Survey Explorer map 178 'Llanelli & Ammanford/Rhydaman'〕
==Geology==
The hill is formed from the coarse Twrch Sandstone (formerly known as the Basal Grit) laid down during the Namurian stage of the Carboniferous period. It is defined by faults to east and west.〔Strahan, A. et al. 1907 ''The Geology of the South Wales Coalfield Part VII: the country around Ammanford' (memoir to sheet 230 of the Geological Survey) HMSO, London p176〕 There are a handful of disused gritstone quarries on the southern slope of the hill. Quarrying rights at these sites were stopped by the Brecon Beacons National Park Authority in 2008.〔http://news.bbc.co.uk/1/hi/wales/mid/7473090.stm BBC news item on quarry closure〕 To its north is the large Craigyrodyn Quarry which worked the Carboniferous Limestone outcrop which parallels the narrow band of Twrch Sandstone running west to east through the region.〔British Geological Survey 1:50,000 map sheet 230 'Ammanford'〕
Glacial striae on rock surfaces high on the hill record that during the ice age, glacial ice travelled obliquely across it towards the southwest though lower down, to the south, the ice is recorded as moving more or less from east to west.〔Strahan, A. et al. 1907 ''The Geology of the South Wales Coalfield Part VII: the country around Ammanford' (memoir to sheet 230 of the Geological Survey) HMSO, London p199〕

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