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Boulder clay

Unsorted glacial deposits containing a mix of clay, sand, gravel, and boulders, left behind by retreating ice sheets.

Related terms

  • Clay

    Soil particles smaller than 0.002 mm in diameter, known for high surface area, water-holding ability, and plasticity. Also used as a soil textural class.

  • Sand

    Soil particles between 0.05 and 2 mm in diameter, giving soil a gritty texture and good drainage.

  • Gravel

    Loose rock fragments larger than 2 mm in diameter, commonly found mixed with finer soil fractions.