boulder clay


noun Geology.

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

Origin of boulder clay

First recorded in 1855–60
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British Dictionary definitions for boulder clay

boulder clay

noun

an unstratified glacial deposit consisting of fine clay, boulders, and pebblesSee 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