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boulder clay

noun

, Geology.
  1. a glacial deposit consisting chiefly of unstratified clay with embedded boulders.


boulder clay

noun

  1. an unstratified glacial deposit consisting of fine clay, boulders, and pebbles See also till 4
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Word History and Origins

Origin of boulder clay1

First recorded in 1855–60

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Boulder CanyonBoulder Dam