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单词 upper greensand
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Upper 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.
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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.
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