单词 | greensand |
释义 | greensand/ˈɡriːnsand /noun [mass noun] Geology 1A greenish kind of sandstone, often loosely consolidated.The sample was taken from a thin limestone lens with phosphatic oolites within the phosphatic greensand....
1.1 (usually the Greensand) A stratum largely composed of greensand, deposited during the Cretaceous period and often underlying chalk: the Upper Greensand...
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