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Gyrn Ddu
Gyrn Ddu is a hill near the northeastern corner of the Llŷn Peninsula in the community of Llanaelhaearn in the county of Gwynedd in North Wales. It forms the western half of a wider upland area, another significant top of which is the 510 m summit of Bwlch Mawr to the east. The distinct northern top of Gyrn Ddu is Gyrn Goch, which attains a height of 492 m. The summit of an eastern top which reaches 491 m is crowned by a prehistoric cairn. To the southwest of Gyrn Ddu is the lower top of Moel Pen-llechog, which reaches a height of 316 m, whilst to the south is the 416 m flat top of Moel Bronmiod. == Geology == In common with a number of other isolated hills in Llŷn, Gyrn Ddu is formed by an igneous intrusion of Palaeozoic age.〔(British Geological Survey ‘Geology of Britain Viewer' )〕 The northwestern slopes of Gyn Ddu have been quarried in the past and a number of inclines descend the steep slopes beneath them .
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