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boulder clay

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boulder clay

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

Origin:
1855–60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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boulder clay

noun
unstratified soil deposited by a glacier; consists of sand and clay and gravel and boulders mixed together [syn: till
WordNet® 3.0, © 2006 by Princeton University.
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