blue mud

American  

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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Etymology

Origin of blue mud

An Americanism dating back to 1830–40

Example Sentences

Blue Mud Bay was so named by him on account of the nature of the bottom.

From Project Gutenberg

The Golden Hope was lying immediately over a white sandy 'patch, though both her anchors were embedded in blue mud, which formed an excellent holding-ground.

From Project Gutenberg

Lots of yellow, of course, from the sulphur,—crystals of it, some of them neighbor to an orange tinted crystal, lying in the blue mud.

From Project Gutenberg

But some sense of urgency drove them to give up their fruitless sadism after a while, and drag him through the trail's blue mud by brute strength, two on the neck-chain, two hauling at his waist.

From Project Gutenberg

From the bridge over the remainder of the route, the bottom, with the exception of a few sand pockets, is soft—a blue mud with a large percentage of sand.

From Project Gutenberg