| 单词 | boulder-clay |
| 释义 | > as lemmasboulder-clay boulder-clay n. a clayey deposit belonging to the ice age, and containing boulders, etc. ΘΚΠ the world > the earth > structure of the earth > constituent materials > clay > [noun] > boulder clay till1842 boulder-clay1859 ground-moraine1863 1859 H. Miller Sketch-bk. Pop. Geol. i. 30 The boulder-clay exhibits certain unique appearences. 1878 T. H. Huxley Physiography (ed. 2) xvii. 282 An icy sea, from which the boulder clay and glacial gravels were deposited. 1884 Dawson in Handbk. Canada 324 Stratified sands and gravels overlying the boulder-clay. < as lemmas |
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