| 单词 | seat-stone |
| 释义 | > as lemmasseat-stone seat-stone n. = seat-earth n. ΘΚΠ the world > the earth > structure of the earth > structural features > sedimentary formation > [noun] > stratum > stratum by constitution > strata underlying a coal-seam seat1867 seat-earth1877 seat-stone1878 1878 A. H. Green et al. Coal: Hist. & Uses i. 28 Seat-stones vary very much in their composition, the generality of them are clays. < as lemmas |
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