mudstone definition

  • noun:
    • A fine-grained, dark gray sedimentary stone, formed from silt and clay and similar to shale but without laminations.
    • A fine-grained sedimentary rock whose initial constituents had been clays or muds.
    • A fine argillaceous rock, usually containing more or less sand, notably more difficult than clay, and destitute of every distinct lamination.

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