Acheulean Tradition a Major Facies of the Old World Lower Paleolithic
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Acheulean Tradition A major facies of the Old World Lower Paleolithic whose stone tool assemblages include certain large cutting tool types, especially hand axes and cleavers, the Acheulean Tradition takes its name from Saint-Acheul (Amiens, France), where it was first recognized during the nineteenth century. Acheulean sites are widely distributed in the Old World, from India in the east to Britain in the northwest, including all of Africa, the Near East, and Europe, especially the western half. This broad spatial distribution of the Acheulean Tradition (often simply called “the Acheulean”) is matched by the long period of time over which it persists: The oldest assemblages date from about 1.4 million years ago, while the youngest are perhaps 100,000 years old. It is no longer believed, as formerly, that the whole of the Acheulean was produced by a single human population, which gradually migrated over much of the Old World. Rather, it is one version of a general level of technological achievement, which proved entirely adequate to support the needs of human hunter-gatherers in many regions, over what seems to us a surprisingly long period of time. If one examines in detail the Acheulean lithic assemblages of any one area, it is immediately apparent that there are substantial differences between them, and also changes and developments, as time passed, in the ways in which the tools were made. But even so, the general stability within the Acheulean Tradition remains remarkable, which is exactly why the term continues to be used. Acheulean Stone Tools Hand axes, widely regarded as the hallmark of the Acheulean, are large cutting tools, with various carefully fashioned planforms, the commonest being oval, pear-shaped, lanceolate, and triangular. The cutting edges, convex, concave, or straight, occupy much or all of their circumferences. Many hand axes also have a more or less sharp point, and some have a heavy hammerlike butt. They are usually worked bifacially, that is, both main faces have been flaked during the often symmetrical shaping of the implement. Cleavers are more axlike, with a broad transverse or oblique cutting edge as the main feature and less emphasis on cutting edges at the sides. Because hand axes and cleavers are so readily recognizable, they tend to dominate our perception of Acheulean stone tool kits, which in fact also contain a considerable range of other implements, made by retouching simple flakes of suitable size to make points, knives, and scrapers. Many flakes were also used without formal retouch. As for technological changes through time in the Acheulean, it is broadly true that in the earliest industries the hand axes tend to be thicker and less symmetrical, made by the removal of relatively few flakes with a hard stone hammer. Later, they are often flat and elegantly shaped by the use of a softer hammer (of bone, antler, or wood), which could remove thin trimming flakes, leaving straight and regular cutting edges. Later Acheulean knappers also often show awareness of the “prepared core” flaking methods, such as Levallois technique, which characterize most Middle Paleolithic industries. There is, however, a wide technological range throughout the Acheulean everywhere, rather than a simple, inviolable progression from “crude” to “refined” industries. The implement types made, and the knapping techniques used, are always profoundly influenced by the types of rock locally obtainable, which varied in hardness, grain size, and manner of fracture. Flint and the purer forms of chert are easiest to work, but are not available everywhere. In sub-Saharan Africa, for example, quartzites and many kinds of volcanic rocks, especially fine-grained lavas, were frequently used. Origins and Spread of the Acheulean The genesis of the Acheulean Tradition certainly lies in sub-Saharan Africa. Its oldest-known occurrences include sites EF-HR and MLK in Middle Bed II at Olduvai Gorge (Tanzania), Peninj (Tanzania, west of Lake Natron), and Konso-Gardula (southern Ethiopia); dating, mainly by the potassium-argon method, suggests a time range of 1.2 to 1.4 million years. They appear quite suddenly, after over a million years of the Oldowan Tradition, which had only simple tools made from pebbles and flakes. A major technological difference between the two was the Acheulean workers' ability to strike large flakes from boulders, as the blanks from which their hand axes and cleavers were fashioned, rather than depending on whole cobbles or pebbles. This enabled large, broad tools with relatively thin cutting edges to be regularly achieved. It may be no coincidence that Acheulean industries first appeared soon after the emergence of a new hominid type, Homo erectus, larger in both stature and brain than Homo habilis, widely regarded as the maker of the Oldowan. Between about 1.8 and 1.2 million years ago, the first movement of humans out of sub-Saharan Africa occurred. The migration was begun by H. erectus humans, but as time passed, physical evolution and adaptation to new geographical situations brought these early people to a stage that we refer to generally as Homo sapiens, though within it there is considerable local variability: For example, in Europe the early H. sapiens people developed into the well-known Neanderthal population—a process already discernible a quarter of a million years ago and complete by about 120,000 B.P. Sub-Saharan Africa retained its own hominid population during and after the first human migration to other parts of the Old World, and it was apparently here that the development took place from H. erectus, via an early H. sapiens stage, to anatomically modern humans (H. sapiens sapiens), who, by around 100,000 years ago, had themselves spread out of Africa and reached the Near East. The foregoing clearly implies that, over time, several different human types must have made Acheulean industries. Some of the people involved in the first Homo erectus movement out of sub-Saharan Africa were certainly hand-axe makers, since stone tool manufacture in the mainstream Acheulean Tradition spread during the Early and Middle Pleistocene to North Africa and the Near East, into southern and western Europe, and eastward to the Indian subcontinent, though arrival dates are not clear everywhere. There was little penetration of Central or northern Asia at this time, and none of Australasia or the Americas. China and Southeast Asia, however, have many important Lower Paleolithic sites, but their stone artifacts do not belong to the Acheulean Tradition as described here. If the first humans to penetrate east of India were Acheuleans, they would have found few rocks suitable for hand-axe manufacture, and would have had to content themselves with stone tools of less sophisticated design to fulfill the same functions; other materials, such as bamboo, could also have provided highly effective points and cutting edges (though without surviving in the archaeological record). Accordingly, we need not assume that the earliest humans of the Far East had a separate ultimate origin from those who spread the Acheulean Tradition so widely elsewhere: Quite different artifact types could easily have become and remained the fashion in the Far East, especially since there is little sign of subsequent contact with Lower Paleolithic peoples away to the west, during the Middle Pleistocene. The Acheulean, however, is rarely alone in any area where it occurs: There are often contemporary lithic assemblages from which the typical hand axes and cleavers are quite absent. Examples of this phenomenon include the Soan Tradition of India, the later stages of the Oldowan in East Africa, the flake-tool industries of central Europe, and the Clactonian in Britain. The explanation need not always be the same. Particular human groups must often have produced specialized tool kits to deal with the many different activities undertaken by hunter-gatherers, exploiting seasonal resources of food and raw materials over territorial ranges comprising very variable landscapes: The classic hand axes and cleavers will not always have been the most advantageous tools. But there also remains the possibility of distinct contemporary human groups, maintaining their own separate tool-making traditions, for whatever reasons, with room enough for all, in any given region. Acheulean Settlements Acheulean sites mainly occur as scatters of the typical stone artifacts, associated with the channels or floodplains of streams and rivers, or with lake margins. Early humans favored such locations for settlement, but the traces they left were liable to subsequent hydraulic disturbance. Structures, hearths, and fragile materials like wood or plant remains only rarely survive in association with the stone artifacts. At a few sites, such as Torralba (Spain), Kalambo Falls (Zambia), and Gesher Benot Ya'aqov (Israel), waterlogging has preserved traces of worked wood. The remains of bone at many sites, sometimes with cut marks left by stone implements, make clear that the Acheulean people exploited the carcasses of large and small animals, whether as hunters or scavengers. They occasionally used caves or rock shelters as habitations or working places, a few examples being Montagu Cave and Cave of the Hearths (South Africa), Tabun Cave (Israel), Lazeret Cave (southern France), and Pontnewydd Cave (northern Wales). Sometimes they occupied coastal locations, as at Boxgrove (Sussex, England) or Terra Amata (Nice, France), though there is little evidence for their exploiting marine fish or shellfish. Occasional finds on higher ground, for example, the chalk downlands of southern England, testify to their use of the land around and between their main campsites. No unequivocal evidence relating to Acheulean beliefs or ritual has yet been discovered. The End of the Acheulean Tradition The late Acheulean lasts into the Upper Pleistocene, but from around 180,000 B.P. the late Lower Paleolithic and earlier Middle Paleolithic overlap in time and to some extent blend together, as hand axes and cleavers lose importance in many areas, while specialized tools and projectile points, made by retouching specially struck flakes, increase.