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Abercriban Quarries : ウィキペディア英語版 | Abercriban Quarries Abercriban Quarries is a Site of Special Scientific Interest in Brecknock, Powys, Wales. The quarries are located near the village of Pontsticill, overlookin Pontsticill Reservoir. Abercriban Quarries comprise two small disused quarries. The site is of special interest for the rock exposures of the Grey Grit Formation of the Upper Old Red Sandstone, these exposed rocks span the boundary between the Carboniferous and Devonian periods of geological time, approximately 360 million years ago. ==Notes==
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「Abercriban Quarries」の詳細全文を読む
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