(a) a horizontal stratum of porous or poorly consolidated, often waterlogged, sandstone or other sedimentary rock; spec. (with the) a formation of…
| 单词 | θ4767 |
| 释义 | the world > the earth > structure of the earth > structural features > sedimentary formation > [noun] > stratum > stratum by constitution > sandstone (4) water sill1817 (a) a horizontal stratum of porous or poorly consolidated, often waterlogged, sandstone or other sedimentary rock; spec. (with the) a formation of… post1876 Mining. A compact stratum of sandstone, limestone, etc. Now rare. sand-bat1876 sand-burr1876 = sand-bat n. (see also sand-bur, n.). |
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