单词 | upper greensand |
释义 | > as lemmasUpper Greensand 1. Geology. Also with capital initial. Sand or imperfectly consolidated sandstone of a greenish colour, often resulting from the presence of glauconite; (also) the mineral glauconite. Also: a deposit or stratum of such rock; spec. each of two rock formations (in full Upper Greensand, Lower Greensand) consisting largely of glauconitic sandstone of early Cretaceous age, occurring across much of southern England, and lying respectively above and below the gault clay. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > sedimentary rock > [noun] > sandstone > greensand greensand1700 fox-mould1808 carstone1815 malm rock1833 potash greensand1869 the world > the earth > minerals > types of mineral > silicates > phyllosilicate > [noun] > mica > glauconite green earth1794 glauconite1836 greensand1873 1700 Philos. Trans. (Royal Soc.) 22 485 Above this Chalk the Oyster-shells lye in a bed of green Sand. 1796 R. Kirwan Elements Mineral. (ed. 2) II. 149 Green Sand of Peru. Its colour is Grass Green..contains about 56 per cent. of Copper. 1815 W. Smith Mem. to Map Strata Eng. & Wales 42 In the western parts..the sand immediately beneath the chalk is generally called green sand. 1824 W. H. Fitton in Ann. Philos. New Ser. 8 461 It has been suggested to me..that the terms upper and lower greensand would be preferable, for the denomination of the beds which I have named firestone and greensand. 1847 D. T. Ansted Anc. World x. 228 The Upper Greensand is generally barren of fossils. 1873 J. W. Dawson Story Earth & Man ix. 229 The mineral Glauconite or ‘green-sand’. 1922 J. C. Hughes Geol. Story Isle of Wight vi. 37 Some prefer to call the Lower Greensand Vectian..and the Upper Greensand Selbornian. 1946 H. Woods Palæontol. Invertebr. (ed. 8) 54 Parkeria, which is found in the Cambridge Greensand, probably belongs to this Order. 1965 G. J. Williams Econ. Geol. N.Z. i. 3/1 The limestones were followed in many areas by disconformities on which greensand accumulated. 2004 R. J. Lisle Geol. Structures & Maps (ed. 3) ii. 24 The base of the Lower Greensand..encountered in three boreholes in Suffolk. < as lemmas |
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