Boulder clay, in geology, is a deposit of clay, often full of boulders, which is formed in and beneath glaciers and ice-sheets wherever they are found, and was the typical deposit of the Glacial Period in northern Europe and North America.
boulder clayとは意味:漂礫土{ひょうれきど} boulder clay meaning: Noun: boulder clay bówldur kley Unstratified soil deposited by a glacier; consists of sand and clay and gravel and boulders mixed together - till Derived forms: boulder clays...boulder clay перевод:1) _геол. валунная глина