boulder clay

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

1855–60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
boulder clay
See also till an unstratified glacial deposit consisting of fine clay, boulders, and pebbles

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
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.
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