boulder-clay

boulder clay

noun Geology.
a glacial deposit consisting chiefly of unstratified clay with embedded boulders.
Origin:
1855–60

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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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
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Boulder-clay is always a great word to know.
So is doohickey. Does it mean:
a scrap or morsel of food left at a meal.
a gadget; dingus; thingumbob.
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