| 翻訳と辞書 |
Garreg Las
Garreg Las is a subsidiary summit of Fan Brycheiniog in the Brecon Beacons National Park (Parc Cenedlaethol Bannau Brycheiniog) in Carmarthenshire, southern Wales. Its summit sits towards the northern end of a broad north-south ridge, Esgair Hir ("long ridge"), at above sea level. The hill is sometimes referred to as Twyn Swnd.〔Nuttall, John & Anne (1999). The Mountains of England & Wales - Volume 1: Wales (2nd edition ed.). Milnthorpe, Cumbria: Cicerone. ISBN 1-85284-304-7.〕
A subsidiary top just over to the north of the main summit is Carreg yr Ogof (meaning "rock of the cave"), whose name reflects its limestone geology. Its top, at above sea level, is crowned by a trig point.〔Ordnance Survey Explorer map OL12 'Brecon Beacons National Park: western area'〕
==Geology==
Garreg Las is formed from the Twrch Sandstone, a coarse sandstone (formerly known as the Basal Grit) of the Marros Group (formerly the Millstone Grit Series) which was laid down during the Carboniferous period. Wrapped around its northern and western flanks is a narrow band of Carboniferous Limestone which gives rise to a karst landscape. The Twrch Fechan Fault defines its eastern margin and brings Old Red Sandstone rocks into contact with the limestone on this flank. A number of major shakeholes in the Basal Grit adorn these eastern flanks, one of which, known as 'Pwll Cynrig' is flooded.〔British Geological Survey 1:50,000 map sheet 230 'Ammanford'〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Garreg Las」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|