blue mud

noun

, Geology, Oceanography.

a deep-sea sediment of fine silt and clay that derives its bluish color from organic material and iron sulfide.

An Americanism dating back to 1830–40

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

Stumps by the hundred, three to fifteen feet high, rooted in a stream of fine blue mud on cobbles, still have their bark on.

Here and there I find gems of thought, but one has to wade through a morass of blue mud to get at them.

We steered on till eight o'clock, and then anchored in 21 fathoms, blue mud.

We sounded with twenty-six fathoms, over a bottom of blue mud.

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