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boulder clay

noun Geology.
  1. a glacial deposit consisting chiefly of unstratified clay with embedded boulders.
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Origin of boulder clay

First recorded in 1855–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for boulder clay

Historical Examples

  • Might they not belong merely to the talus of this bank of boulder-clay?

    The Cruise of the Betsey

    Hugh Miller

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

  • Miller was one of the pioneers in the study of the Boulder-Clay.

    Hugh Miller

    William Keith Leask

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

    Prehistoric Man

    W. L. H. Duckworth

  • 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

noun
  1. an unstratified glacial deposit consisting of fine clay, boulders, and pebblesSee also till 4
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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