| 单词 | oxford clay |
| 释义 | > as lemmasOxford 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.Oxford clay Oxford clay n. Geology a stiff grey-blue fossiliferous Jurassic clay found in central England. ΘΚΠ the world > the earth > structure of the earth > age or period > stratigraphic units > [noun] > secondary or Mesozoic > Jurassic > specific Oxford clay1812 cornbrash1813 Kellaways1813 Portland oolite1814 coral-rag1816 oolite1816 Oxford oolite1818 Kimmeridge clay1830 lias1833 Portland sand1836 skull-cap1839 Solenhofen slate1841 Stonesfield slate1855 Callovian1856 Tithonian1869 coralline oolite1871 Lincolnshire limestone1873 Ampthill Clay1877 Aalenian1882 Pliensbachian1903 1812 Philos. Mag. 40 53 The third or great oelite, comprising the green sand, Bedford sand, 1st oelite or Portland stone, clunch, or Oxford clay. 1818 W. Phillips Sel. Facts Geol. Eng. & Wales 66 In these..are included the three strata..namely, the Forest marble, the Cornbrash limestone, and the clunch clay (Oxford Clay). 1898 Jrnl. Anthropol. Inst. 27 225 If the diviner's recommendations were acted on, the council would be boring into a stratum of Oxford clay. 1989 J. Campbell-Kease Compan. Local Hist. Res. (BNC) 358 A broad band of Corallian Limestone and Sand crosses the central part..and this is bounded on each side by Oxford Clay. 2012 J. Steane & J. Ayres Trad. Buildings Oxf. Region v. 51/1 They [sc. moats] are found in large numbers on the Oxford Clay, in the upper Thames valley and in the north-east of the county. < as lemmas |
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