gaults

Noun

gault (countable and uncountable, plural gaults)

1. A type of stiff, blue clay, sometimes used for making bricks.
   • As he spoke, they turned off the main line of the rolling clays toward the foot of the chalk hills, and began to brush through short cuttings of blue gault and "green sand," so called by geologists, because its usual colours are bright brown, snow-white, and crimson.1901, Charles Kingsley, Two Years Ago, Volume I

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