WordReference Random House Unabridged Dictionary of American English © 2025
boul′der clay′, [Geol.]
  1. Geologya glacial deposit consisting chiefly of unstratified clay with embedded boulders.
  • 1855–60

Collins Concise English Dictionary © HarperCollins Publishers::
boulder clay
  1. an unstratified glacial deposit consisting of fine clay, boulders, and pebbles
    See also till4
'boulder clay' also found in these entries (note: many are not synonyms or translations):
till

Forum discussions with the word(s) "boulder clay" in the title:


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