marlstone
noun Date: 1756 a rock that consists of a mixture of clay materials and calcium carbonate and often contains kerogen

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • Marlstone — Marl stone , n. (Geol.) A sandy calcareous straum, containing, or impregnated with, iron, and lying between the upper and lower Lias of England. [1913 Webster] …   The Collaborative International Dictionary of English

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