The record of the Middle Stone Age/Middle Palaeolithic in North Africa and the Sahara is extremely rich, although the almost complete absence of dated sites makes its interpretation difficult. In sub-Saharan Africa, the MSA first appears between ~350,000 - 300,000 years ago, disappearing in the last 50,000 years. This 300,000 year period encompasses major climatic shifts that would have made the Central Sahara at certain times uninhabitable and at others part of a rich ecosystem interconnected by rivers and lakes, deeply affecting the biogeographic distribution of hominin populations. The period also encompasses major evolutionary events, in particular the first evidence of modern humans in East Africa around 200,000 years ago, as well as of their first dispersal out of Africa in the subsequent wet interglacial phase 130,000-100,000 years ago. The beginning of this dispersal is archaeologically difficult to identify, as the stone tools manufactured by early humans did not differ substantially from those produced by other hominins since ~ 300,000 years ago (including the Neanderthals). However, once established in North Africa, these early humans developed a new cultural identity, the Aterian, which contains distinctive stone tools. The Aterian has been dated in Morocco to from 110,000 to at least 80,000 years ago (Barton 2009). However, the extremely arid conditions that prevailed in the Central Sahara between 70,000-14,000 years ago probably restricted the temporal extent of the Aterian occupation in the region.
A synthesis of the Early and Middle Stone Age chronology of the Central Sahara is outlined
here.
Although climatic amelioration took place soon after 14,000 years ago, re-colonisation of the Central Sahara only took place from ~12,000 years ago (Cremaschi and di Lernia 1998, di Lernia 1999). The people who migrated to the Central Sahara at this time, known locally as the ‘Acacus’ phase, were hunter-gatherers, whose origins are yet not fully known. However, in their later phases, elements of their culture, particularly pottery styles, strongly suggest they were related to a large sub-Saharan African cultural network whose subsistence was associated with the exploitation of the newly expanded river and lake systems.
Their occupation was followed by the introduction of animal herding as the main economic system in the area. This Pastoral-Neolithic period can be divided into a series of sub-phases, in part related to an increased dependence on animal husbandry, with associated changes in material culture. Around 5,000 years ago, there was another major incident of climatic change, with the onset of the hyper-arid conditions that have continued to the present.
The Late Pastoral phase represents the adaptation of the human groups in the Central Sahara to the new conditions, culminating by about 3,000 years ago with the development of irrigated agriculture. The success of oasis farming was the basis on which the Garamantian civilisation was built. Although the Garamantes represent the high point of the oasis farming society before the late 20th century, their successors have continued to farm the Wadi al-Ajal until the present. The dating framework for the Holocene period in this part of the Central Sahara is outlined
here, and a synthesis of the pattern of occupation in relation to lake levels during this time is outlined
here.