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2.1. Human Evolution

  • Chronological Background:

    • Earth formed c. 4.5 billion years Before Present (B.P.); the earliest life emerged between 3 and 1 billion years B.P.
    • Primates branched off c. 200–170 million years B.P., later diverging into Pongidae (apes) and Hominidae (human ancestors).

  • East African Rift Valley (Cradle of Humanity):

    • Early Hominids:
    • Chororapithecus (10 million B.P.) discovered in Anchar, West Hararghe.
    • Ardipithecus ramidus kadabba (5.8–5.2 million B.P.) and Ardipithecus ramidus (4.2 million B.P.) discovered in Middle Awash and Afar.
    • Australopithecines:
    • Fossils discovered at Belohdelie (3.6 million B.P.) and Lake Turkana (A. anamensis).
    • Australopithecus afarensis: Includes "Selam" (3.3 million B.P., Dikika) and "Lucy / Dinkinesh" (3.18 million B.P., Hadar; bipedal female, 40% complete body skeleton, 30 kg30\,\text{kg}, 1.07 m1.07\,\text{m} tall).
    • Australopithecus garhi (2.5 million B.P.) discovered at Bouri, Middle Awash.
    • Genus Homo (Emergence c. 2–2.5 million B.P.):
    • Homo habilis (1.9 million B.P., Lower Omo): Known for skillful manual tool use.
    • Homo erectus (1.6 million B.P., Melka Kunture, Konso Gardula, Gadeb): Upright posture, cranial capacity of 900–1100 cc900\text{--}1100\,\text{cc}; spread from Africa across the globe.
    • Archaic Homo sapiens (e.g., "Bodo", 400,000 B.P., Middle Awash): Cranial capacity of 1300–1400 cc1300\text{--}1400\,\text{cc}.
    • Homo sapiens sapiens: Kibish fossils dated to 195,000 B.P. represent the world's oldest anatomically modern human remains; Homo sapiens idaltu dated to 160,000 B.P. in Middle Awash.

  • Cultural Evolution and Lithic Technologies:

    • Mode I (Olduwan): Crude, mono-facial tools produced by direct percussion (e.g., Dikika fossil marks at 3.4 million B.P.; Gona tools at 2.52 million B.P.).
    • Mode II (Acheulean): Bifacial hand-axes produced by indirect percussion by Homo erectus (c. 1.7 million B.P.); accompanied by fire usage and burial rites.
    • Mode III (Sangoon): Refined, flexible tools crafted from obsidian by Homo sapiens (e.g., Gademotta, 200,000 B.P.).
    • Stone Age Eras:
    • Paleolithic (Old Stone Age, 3.4 million – 11,000 B.P.): Characterized by language development, cave shelters, and labor division based on sex and age.
    • Mesolithic (Middle Stone Age, 11,000 – 10,000 B.P.): Transitional era.
    • Neolithic (New Stone Age, 10,000 – 6,000 B.P.): Transition to food production.
2.2. Neolithic Revolution
  • Socio-Economic Transition:
    • Shift from nomadic hunting and gathering to sedentary agriculture and animal husbandry, spurred by climate shifts and population pressures.
  • Domestication in Ethiopia and the Horn:
    • Indigenous Flora: Cultivation of native domesticates including teff, dagussa, nug, and enset (which curtailed shifting cultivation and limited soil exhaustion).
    • Archaeological Evidence:
    • Polished axes, pottery, and grinding tools recovered at Emba-Fakeda, Aqordat, and Barentu.
    • Agricultural tools at Gobodara rock shelter; remains of domestic cattle, chickpeas, and vegetables at Lalibela Cave.
    • Grass-harvesting tools and pastoral rock art at Laga Oda, alongside cattle evidence at Lake Basaqa.
    • Pastoral connections traced to broader African domestication centers (e.g., Sudan, Libya, West Africa) introducing breeds such as Zebu cattle.