lithomarge noun. ['lɪƟǝ(ʊ)mɑ:dʒ] M18.
[mod. Latin lithomarga, formed as LITHO- + Latin marga marl.]
Geology. Orig., any of various soft claylike minerals, including kaolin. Now usu., a smooth hardened reddish deposit containing kaolinite and formed by the degradation of basalts.

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