| 单词 | iron pan |
| 释义 | > as lemmasiron pan iron pan n. a hard, impermeable substratum of soil cemented together by iron oxides; (also) the material of such a layer; cf. pan n.1 7b, hardpan n. 1. ΘΚΠ the world > the earth > minerals > mineral sources > [noun] > strata containing minerals fuller's eartha1350 fulling eartha1399 fulling clay1647 second bottom1787 iron pan1811 ledge1847 blue lead1854 oil shale1866 oil sand1875 Cambridge coprolite1881 Cambridge greensand1882 gem-bed1886 1811 W. Marshall Rev. Rep. to Board Agric. from Eastern Dept. Eng. 447 Even (is it here meant) to the three of four inch deep sands of Norfolk; tho resting on an iron ‘pan’! 1838 W. L. Rham Outl. Flemish Husbandry ii. 12 in Brit. Husbandry (Libr. Useful Knowl.) (1840) III Between the sand and the loam, an indurated crust of earth cemented by carbonate of iron, which is well known to all improvers of poor sands by the name of the iron pan. 1912 H. B. Woodward Geol. Soils & Substrata xix. 248 There is a general absence of lime, and iron-pan is sometimes encountered in the subsoil. 2000 A. J. Whitten et al. Ecol. Sumatra (new ed.) viii. 254 The hard iron pan can cause temporary waterlogging of the soil after heavy rain. < as lemmas |
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