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An earlier origin for the Acheulian.

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The Acheulian stone tool technology emerged 1.76 million years ago in Kenya, predating previous estimates. Its coexistence with Oldowan tools suggests multiple hominin groups with distinct behaviors existed in Africa.

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Area of Science:

  • Paleoanthropology
  • Archaeology
  • Geochronology

Background:

  • The Acheulian techno-complex, defined by bifacial stone tools, likely originated in Africa around 1 million years ago.
  • Its emergence is linked to human brain evolution but remains poorly understood due to a scarcity of well-dated early sites.
  • Previous understanding suggested a chronological succession between Oldowan and Acheulian technologies.

Purpose of the Study:

  • To investigate the origins and early development of Acheulian stone tool technology.
  • To establish a more precise timeline for the first appearance datum (FAD) of the Acheulian.
  • To explore the relationship between Acheulian and Oldowan technologies at their earliest stages.

Main Methods:

  • Excavation and analysis of the lithic assemblage at the Kokiselei 4 archaeological site in the Nachukui formation, West Turkana, Kenya.
  • Detailed geological contextualization and dating of the archaeological findings.
  • Comparative analysis of Acheulian and Oldowan artefacts found in association.

Main Results:

  • Discovery of characteristic early Acheulian tools at Kokiselei 4, dating to 1.76 million years ago.
  • This finding significantly pushes back the established FAD for Acheulian technology by approximately 360,000 years.
  • Simultaneous presence of Oldowan and Acheulian artefacts at the Kokiselei site complex was documented.

Conclusions:

  • The Acheulian technology is at least 1.76 million years old, originating in Africa.
  • The coexistence of Oldowan and Acheulian tools indicates they were not strictly time-successive, challenging previous evolutionary models.
  • The Acheulian's availability did not coincide with the earliest human dispersal out of Africa, suggesting diverse hominin behaviors and dispersal strategies.