greensand Meaning, Definition & Usage
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noun an olive-green sandstone containing glauconite
WordNet
Green"sand` noun
Definitions
(Geol.) A variety of sandstone, usually imperfectly consolidated, consisting largely of glauconite, a silicate of iron and potash of a green color, mixed with sand and a trace of phosphate of lime. ✍Greensand is often called marl , because it is a useful fertilizer. The greensand beds of the American Cretaceous belong mostly to the Upper Cretaceous.
