Mining and Geology. A vein; a line or layer of ore within a vein; a stratum or dyke of stone or rock.
| 单词 | θ4770 |
| 释义 | the world > the earth > structure of the earth > structural features > sedimentary formation > [noun] > stratum > stratum by constitution > hard stratum (3) rib1667 Mining and Geology. A vein; a line or layer of ore within a vein; a stratum or dyke of stone or rock. sill1794 A bed, layer, or stratum of rock, esp. of an intrusive igneous rock. In modern use, a tabular igneous intrusion lying parallel to the surrounding… burnt stuff1852 (see quot. 1945). |
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