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boulder clay

noun

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


boulder clay

noun

  1. an unstratified glacial deposit consisting of fine clay, boulders, and pebbles See 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


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Word History and Origins

Origin of boulder clay1

First recorded in 1855–60
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Example Sentences

The U-shaped character of the valleys was very pronounced, while boulder-clay obtruded itself everywhere on our notice.

That there might be several deposits of the boulder-clay with intervening strata, does not appear to have been suggested.

(B) The ‘sub-boulder-clay’ skeleton, discovered near Ipswich in 1911, was in an extraordinarily contracted attitude.

The boulder clay of Germany is supposed to have accumulated underneath this vast "mer de glace," as he calls it.

The deposits immediately preceding the Forest-Bed would also be contemporaneous with the lower continental boulder clay.

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