boulder clay

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

Origin:
1855–60

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boulder clay
 
n
See also till an unstratified glacial deposit consisting of fine clay, boulders, and pebbles

Collins English Dictionary - Complete & Unabridged 10th Edition
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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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