In Australia, a hafted chisel made to work hardwoods. It is a thick, round stone flake, usually about 5 cm long, with a steeply trimmed working edge opposite an obtuse-angled striking platform. They usually have a prominent bulb and convex bulbar surface. Ethnographic examples are set in gum on the end of a wooden handle or spearthrower. The edge would be resharpened until the flake became elliptical, when it is discarded. In this form, with a heavily step-flaked edge opposite the striking platform, it is termed a 'tula adze slug'. Tula adzes are restricted to more arid regions and the oldest examples come from Puntutjarpa (c 8000-5000 BC) and are exactly like those still used by desert Aborigines.