indurated clay(n = noun.substance) - hardened clay;
is a kind of dirt, soil
bleaching clay, boulder clay, cassius clay, cassius marcellus clay, china clay, clay, clay pigeon, clay pipe, clay sculpture, henry clay, henry clay frick, indurated, lucius clay, lucius dubignon clay, pipe clay, porcelain clay, potter's clay, red clay, residual clay, sedimentary clay