- a glacial deposit consisting chiefly of unstratified clay with embedded boulders.
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
Might they not belong merely to the talus of this bank of boulder-clay?
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
- an unstratified glacial deposit consisting of fine clay, boulders, and pebblesSee 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