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clay stone

or clay·stone

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noun Geology.
  1. argillite.

Origin of clay stone

First recorded in 1770–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for clay stone

Historical Examples

  • The bulk of the island appears to be composed of a compound rock, formed of clay-stone and potstone intermixed.

    The Mission to Siam, and Hu the Capital of Cochin China, in the Years 1821-2

    George Finlayson

  • The fire was soon kindled, and the clay-stone calumet filled with “kini-kinik.”