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单词 millstone grit
释义 millstone grit Geol.
[f. millstone + grit n.1]
A hard siliceous rock belonging to the carboniferous series and occupying in Britain and elsewhere a stratigraphical position immediately below the coal-measures.
1786Whitehurst Orig. St. Earth (ed. 2) 182 Millstone-Grit,..a coarse sandstone, composed of granulated quartz and quartz pebbles.1813Bakewell Introd. Geol. 136 A mass of coarse grit-stone, called by Mr. Whitehurst mill-stone grit.1876Page Adv. Text-bk. Geol. xiv. 250 Thick beds of quartzose sand-stone known as the millstone grit.
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