Clunch

Flint and the pale stone, clunch used together in a checkerboard pattern on the wall of the side chapel at St Michael's Church, Mickleham, Surrey.

Clunch is a traditional building material of chalky limestone rock used mainly in eastern England and Normandy. Clunch distinguishes itself from archetypal forms of limestone by being softer in character when cut, such as resembling chalk in lower density, or with minor clay-like components.