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. |