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volcanic tuff

tuff2 .
Origin of volcanic tuff
First recorded in 1805-15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for volcanic tuff
Historical Examples
  • This latter material possesses the character of a volcanic tuff, which is a hardened clay.

  • The great mass of the surface of the mountain, not specially mentioned above, is volcanic tuff.

    Etna G. F. Rodwell
  • At one place I noticed an Indian trail leading up a ridge apparently consisting of volcanic tuff.

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