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blue mud

noun Geology, Oceanography.
  1. a deep-sea sediment of fine silt and clay that derives its bluish color from organic material and iron sulfide.
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Origin of blue mud

An Americanism dating back to 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for blue mud

Historical Examples of blue mud

  • The north of Blue-Mud Bay has furnished also specimens of ancient sandstone; with columnar rocks, probably of clink-stone.

    Narrative of a Survey of the Intertropical and Western Coasts of Australia] [Volume 2 of 2]

    Phillip Parker King