| 单词 | plastic clay |
| 释义 | > as lemmasplastic clay Clay consists mainly of aluminium silicate, and is derived mostly from the decomposition of feldspathic rocks. The various beds are distinguished geologically as boulder clay, Kimmeridge clay, London clay, Oxford clay, Purbeck clay, etc. Particular kinds of clay are known as brick clay, fatty clay, plastic clay, porcelain clay, and potter's clay; pipe-clay, etc. Cf. fireclay n.extracted from clayn.plastic clay plastic clay n. (also Plastic clay) Geology clay particularly suited to being shaped; spec. (clay from) any of the middle group of the Eocene clay beds, immediately underlying the London clay (cf. Reading n.3 3). ΘΚΠ the world > the earth > structure of the earth > age or period > stratigraphic units > [noun] > tertiary or Cenozoic > Eocene > specific plastic clay1811 calcaire silicieux1833 Woolwich-beds1859 coryphodon bed1895 1811 J. Farey Gen. View Agric. Derbyshire I. 455 Clay is of important use, for lining the bottoms of..Artificial Ponds or Meers: tenacious or plastic clay fit for this purpose, they call Water-Clay. 1812 T. Webster Let. 2 Aug. in H. C. Englefield Descr. Isle of Wight (1816) 210 The clay connected with this sand is frequently fit for the potter, and hence has been called the plastic clay. 1885 C. Lyell Elem. Geol. (ed. 4) 229 Woolwich and Reading series.—..formerly called the Plastic clay, as it agrees with a similar clay used in pottery, which occupies the same position in the French series. 1961 B. Kummel Hist. Earth 8/2 Of the strata above the Purbeck beds and below the Plastic clay, the most conspicuous unit is the Chalk. < as lemmas |
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