| 单词 | weald clay |
| 释义 | > as lemmasweald clay weald clay n. the upper stratum of the Wealden formation immediately above the ‘Hastings sand’; also plural with reference to the various subdivisions of this stratum. ΘΚΠ the world > the earth > structure of the earth > age or period > stratigraphic units > [noun] > secondary or Mesozoic > Cretaceous > specific gault1575 weald clay1822 Wealden1828 Neocomian1845 Washita1860 Albian1863 Fairlight clays1874 Maastrichtian1931 1822 W. D. Conybeare & W. Phillips Outl. Geol. Eng. & Wales 145 A second valley..occupied by the argillaceous beds which we have called the Weald clay. 1878 Chamb. Encycl. X. 114 The Hastings beds contain more sandstone and less clay than those of the upper Weald Clays. < as lemmas |
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