Levallois technique in the context of "Mousterian"

In archaeology, in particular of the Stone Age, lithic reduction is the process of fashioning stones or rocks from their natural state into tools or weapons by removing some parts. It has been intensely studied and many archaeological industries are identified almost entirely by the lithic analysis of the precise style of their tools and the chaîne opératoire of the reduction techniques they used.

Normally the starting point is the selection of a piece of tool stone that has been detached by natural geological processes, and is an appropriate size and shape. In some cases solid rock or larger boulders may be quarried and broken into suitable smaller pieces, and in others the starting point may be a piece of the debitage, a flake removed from a previous operation to make a larger tool. The selected piece is called the lithic core (also known as the "objective piece"). A basic distinction is that between flaked or knapped stone, the main subject here, and ground stone objects made by grinding. Flaked stone 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 the lithic core. 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, of 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).

Ksar Akil (also Ksar 'Akil or Ksar Aqil) is an archeological site 10 km (6.2 mi) northeast of Beirut in Lebanon. It is located about 800 m (2,600 ft) west of Antelias spring on the north bank of the northern tributary of the Wadi Antelias. It is a large rock shelter below a steep limestone cliff.

It was first noticed by Godefroy Zumoffen in 1900 and first studied by A. E. Day in 1926 then first systematically excavated by J.G. Doherty, S.J., and J.F. Ewing, S.J., in 1937–1938 and again in 1947–1948, then later by Jacques Tixier in 1969–1975 before research was interrupted by the Lebanese Civil War.

The Sangoan is a prehistoric lithic industry of sub-Saharan Africa, broadly dated to the later part of the Early Stone Age (ESA) and the transition to the Middle Stone Age (MSA), approximately between 500,000 and 300,000 years ago. First identified in the 1920s at Sango Bay in Uganda, the industry is characterized by heavy-duty core tools such as picks, core axes, choppers, and scrapers, often produced on large cobbles or blocks of coarse-grained stone. These minimally shaped tools were likely used for woodworking, digging, or other subsistence tasks.

Archaeological sites associated with the Sangoan have been found across a broad ecological and geographical range, including rainforest, woodland, and savanna environments. This distribution extends from Central and East Africa to parts of southern and possibly northern Africa, with debated evidence even reaching the Mediterranean. The Sangoan is noted for its technological variability, its lack of consistent diagnostic tool types, and the apparent absence of systematic Levallois or blade-based reduction methods.