Chiefly Mining. Hardened clay, slate, or shale. Also with distinguishing word. Now rare.
| 单词 | θ5622 |
| 释义 | the world > the earth > structure of the earth > constituent materials > rock > sedimentary rock > [noun] > shale (31) metal1672 Chiefly Mining. Hardened clay, slate, or shale. Also with distinguishing word. Now rare. shale1747 An argillaceous fissile rock, the laminæ of which are usually fragile and uneven, and mostly parallel to the bedding; often overlying a coal… shillet1777 = shale, n.2 Also attributive. plate1794 Mining (chiefly English regional (northern)). Rock that splits readily into laminae; shale. Now rare. skerry1844 Earth or stone of a shaly nature. plate-shale1881 = sense 19. plate rock1893 = sense 19. Subcategories:— type of (1) — bituminous shale (6) — others (17) |
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