marl·stone /ˈmɑr(ə)lˌston/
泥灰土之一種
Marl·stone n. Geol. A sandy calcareous straum, containing, or impregnated with, iron, and lying between the upper and lower Lias of England.
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marlstone
n : metamorphic rock with approximately the same composition as
marl [syn: marlite]