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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Northampton Sand ： ウィキペディア英語版 Northampton Sand The Northampton Sand, sometimes called the Northamptonshire Sand is a geological formation of Jurassic age found in the East Midlands of England. Particularly in the twentieth century, it has been of economic importance as a source of iron ore, but is now worked much less. The Northampton Sand Formation constitutes the lowest part of the Inferior Oolite Series and lies on the upper Lias clay. It attains a maximum thickness of up to to the north and west of Northampton where it lies in a subterranean basin. In the south, it fades out around Towcester. Northward from the edge of the basin in the upper Lias, under Northampton, it lies progressively lower beneath the Jurassic Lincolnshire limestones. A little to the north of Corby Glen () it is at about from the surface. It fades out under north Lincolnshire as the strata rise towards the Market Weighton Axis. Fossils found in it indicate that it dates from the early Bajocian (beginning 171.6 million years ago) and formed in an extensive, shallow sea on the northwestern margin of the London-Brabant Massif. ==Commercial exploitation== There is a description of the twentieth century exploitation of the Northampton Sand for iron-smelting in the Wellingborough article. 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「Northampton Sand」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.