The term regolith is used for the layer or mantle of fragmental and unconsolidated rock and mineral material, whether residual or transported, that rests on bedrock. One might quibble that the definit...The term regolith is used for the layer or mantle of fragmental and unconsolidated rock and mineral material, whether residual or transported, that rests on bedrock. One might quibble that the definition excludes fragmental material that happens to be locally cemented by surficial processes butis otherwise closely related to nearby unconsolidated material.