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boulder clay

noun, Geology
1.
a glacial deposit consisting chiefly of unstratified clay with embedded boulders.
Origin
1855-1860
1855-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for boulder clay
  • Glacial till varies in consistency from sandy, silty clay to gravel and boulder clay.
  • The tills have variable texture, from clay through silt and sandy clay to boulder clay, and have generally low permeability.
British Dictionary definitions for boulder clay

boulder clay

noun
1.
an unstratified glacial deposit consisting of fine clay, boulders, and pebbles See also till4
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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