Mining. The stratum (of clay, rock, etc.) upon which coal lies.
| 单词 | θ4771 |
| 释义 | the world > the earth > structure of the earth > structural features > sedimentary formation > [noun] > stratum > stratum by constitution > strata underlying a coal-seam (3) seat1867 Mining. The stratum (of clay, rock, etc.) upon which coal lies. seat-earth1877 one of the various names applied to the bed underlying a coal-seam. seat-stone1878 = seat-earth n. |
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