direct percussion

Direct percussion with a soft hammer was likely used for accuracy.

Older hand axes were produced by direct percussion with a stone hammer and can be distinguished by their thickness and a sinuous border.

Direct percussion can produce a much stronger signal than airborne vocalizations that couple with the ground, as shown in the Cape mole rat and the Asian elephant.

Archaeological investigation of Olmec basalt workshops suggest that the colossal heads were first roughly shaped using direct percussion to chip away both large and small flakes of stone.

The figures carved on the rocks were made by direct percussion -very similar to chiseling- and they represent animals, human figures, frets, mazes, geometric shapes, heavenly bodies, and probably waves of the sea or aquatic symbols.

Direct percussion of the substrate can yield a much stronger signal than an airborne vocalization that couples with the substrate, however, the strength of the percussive cue is related directly to the mass of the animal producing the vibration.