Lithic reduction involves the use of a hard hammer percussor, such as a
hammerstone, a soft hammer fabricator (made of
wood,
bone or
antler), or a wood or antler
punch to detach
lithic flakes from a lump of
tool stone called a
lithic core (also known as the "objective piece"). As flakes are detached in sequence, the original mass of stone is reduced; hence the term for this process. Lithic reduction may be performed in order to obtain sharp flakes, on which a variety of tools can be made, or to rough out a blank for later refinement into a
projectile point, knife, or other object. Flakes of regular size that are at least twice as long as they are broad are called
blades. Lithic tools produced this way may be
bifacial (exhibiting flaking on both sides) or
unifacial (exhibiting flaking on one side only).