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Hirfynydd
Hirfynydd is a 481-metre-high hill in Neath Port Talbot county borough in South Wales. A Roman road, Sarn Helen, runs along its entire northeast–southwest ridge-line, a route followed by a modern-day byway. To its west is Cwm Dulais and to its southeast is the Vale of Neath. The northern end of the ridge falls away to a broad upland vale containing the Afon Pyrddin and beyond which is the Brecon Beacons National Park. The larger part of the hill is afforested with conifers. In between the plantations are areas of past or present opencasting for coal. == Geology == The upper parts of the hill are formed from the hard-wearing sandstones and intervening mudstones of the Pennant Sandstone. Beneath these are the mudstones and coal seams of the South Wales Coal Measures. All the strata are tilted in a generally southerly direction towards the axis of the South Wales Coalfield syncline though there is significant local variation, due in part to the proximity of the eastern slopes of the hill to the Neath Disturbance.〔British Geological Survey 1:50,000 map sheet 231 ''Merthyr Tydfil'' & accompanying memoir〕
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