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Pen-y-crug
Pen-y-crug is a hill in the Brecon Beacons National Park in the county of Powys, south Wales. It is commonly referred to locally as simply 'The Crug' (''pronounced cree-g''). The Welsh name signifies 'top of the mound'. It slopes are moderately gently on three sides; only to the west do they steepen somewhat. Its flat trig point adorned summit at 331m overlooks the valley of the River Usk to the south. To the southeast are panoramic views over Brecon whilst eastwards are the Black Mountains and south the Brecon Beacons.〔Ordnance Survey Explorer map OL12 'Brecon Beacons National Park: western area'〕 ==Geology== The hill is formed from sandstones and mudstones of the St. Maughans Formation of the Old Red Sandstone laid down during the Devonian period. The lower slopes are formed from mudstones and sandstones of the Raglan Mudstone Formation of late Silurian age. A number of small sandstone quarries, now disused, adorn the upper slopes. The hill probably stood out above the Usk Valley glacier ice at times during the ice age.〔British Geological Survey 1:50,000 map sheet 213 'Brecon' & accompanying sheet explanation〕
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