| 单词 | water sill |
| 释义 | > as lemmaswater sill water sill n. Geology (a) a horizontal stratum of porous or poorly consolidated, often waterlogged, sandstone or other sedimentary rock; spec. (with the) a formation of this kind in the northern Pennines in England (also called the tuft: cf. tuff n.); (b) a thin layer of water trapped between strata. ΘΚΠ the world > the earth > structure of the earth > structural features > sedimentary formation > [noun] > stratum > stratum by constitution > sandstone water sill1817 post1876 sand-bat1876 sand-burr1876 1817 Trans. Geol. Soc. 4 65 The water-sill, called also tuft, a very porous light-coloured sandstone, of a soft texture from the loose aggregation of the small grains which compose it. 1904 Royal Comm. Coal Supplies: 2nd Rep. II. 116 in Parl. Papers (Cd. 1991) XXIII. 7 What is known as a water sill. 1978 W. Fyfe et al. Fluids in Earth's Crust xi. 294 It is likely that the reservoirs would not form lakes of almost infinite extent but that they tend to form ‘water sills’. 1990 K. C. Dunham Geol. Northern Pennine Orefield (ed. 2) ii. 20/2 The Tuft or Water Sill varies lithologically from a fine-grained brown micaceous sandstone to a condition approaching coarse grit. 2007 D. Okaya et al. Continental Plate Boundary 347 The deep conductive layer in New Zealand may have originated as a ‘water sill’ facilitating water-weakening, localized deformation. < as lemmas |
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