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The Collaborative International Dictionary of English v.0.48 (gcide)

Greensand \Green"sand`\ (-s[a^]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.
[1913 Webster]

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.
[1913 Webster]


Marl \Marl\, v. t. [imp. & p. p. {Marled}; p. pr. & vb. n.
{Marling}.] [Cf. F. marner. See {Marl}, n.]
To overspread or manure with marl; as, to marl a field.
[1913 Webster]


Marl \Marl\, v. t. [See {Marline}.] (Naut.)
To cover, as part of a rope, with marline, marking a pecular
hitch at each turn to prevent unwinding.
[1913 Webster]

{Marling spike}. (Naut.) See under {Marline}.
[1913 Webster]


Marl \Marl\, n. [OF. marle, F. marne, LL. margila, dim. of L.
marga marl. Originally a Celtic word, according to Pliny,
xvii. 7: "Quod genus terrae Galli et Britanni margam vocant."
[root]274.]
A mixed earthy substance, consisting of carbonate of lime,
clay, and sand, in very variable proportions, and accordingly
designated as calcareous, clayey, or sandy. See {Greensand}.
[1913 Webster]

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