Boulder clay

Boulder clay is an unsorted agglomeration of clastic sediment that is unstratified and structureless and contains gravel of various sizes, shapes, and compositions distributed at random in a fine-grained matrix. The fine-grained matrix consists of stiff, hard, pulverized clay or rock flour. Boulder clay is also known as drift clay; till; unstratified drift, Geschiebelehm (German); argile á blocaux (French); and keileem (Dutch).

The term boulder clay is infrequently used for gravelly sedimentary deposits of nonglacial origin. These deposits include submarine slump and slide deposits along continental margins, lacustrine debris flow deposits consisting of pebbly mudstones, and coarse, poorly sorted, cobbly diamictons associated with the Guangxi karst, China.

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