Hypertext Webster Gateway: "Greensand"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Greensand \Green"sand`\ (-s?nd`), n. (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.
Note: [hand]Greensand is often called {marl}, because it is a
useful fertilizer. The greensand beds of the American
Cretaceous belong mostly to the Upper Cretaceous.
From WordNet (r) 1.7 (wn)
greensand
n : an olive-green sandstone containing glauconite
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