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boulder clay

noun, Geology
a glacial deposit consisting chiefly of unstratified clay with embedded boulders.
Origin of boulder clay
1855-60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for boulder-clay
Historical Examples
  • Mr. Mackintosh refers to the so-called “stratification” of the boulder-clay, as if that were a proof of accumulation in water.

  • But I have since seen in abundance shells of the boulder-clay.

  • Implements or even bones had been found in the drift and above the boulder-clay, but not below.

    Prehistoric Man W. L. H. Duckworth
  • Might they not belong merely to the talus of this bank of boulder-clay?

  • Rough tors and crags are smoothed off, while boulder-clay nestles on the lee-side.

  • Miller was one of the pioneers in the study of the boulder-clay.

    Hugh Miller William Keith Leask
  • I have since got on a very little way with the Old Red portion of the task; but alas for the boulder-clay portion of it!

  • The latter it must be supposed was then removed, to be replaced by the boulder-clay.

    Prehistoric Man W. L. H. Duckworth
  • The climatic reasons for the supposition that the boulder-clay is a marine deposit have already been given (p. 66).

  • I suppose your boulder-clay in the high grounds will give you no bother.

    James Geikie Marion I. Newbigin
British Dictionary definitions for boulder-clay

boulder clay

an unstratified glacial deposit consisting of fine clay, boulders, and pebbles See also till4
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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