boulder clay

noun Geology.

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

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Origin:
1855–60

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Boulder clay is always a great word to know.

So is convergent plate boundary. Does it mean:

tectonic boundary where two plates are moving toward each other

slow movement of water through the pores in soil or permeable rock

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Collins

World English Dictionary

boulder clay

—n
	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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