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chap 12

Course Code
Michael Schillaci

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Chapter 12: From Hominin to
Homo ergaster: 1.8 mya in Africa
Invented new technology, master fire and to hunt large game
Hominins of the lower Pleistocene: Homo Ergaster work man KNM-ER
Pleistocene epoch began 1.8mya and saw a cooling of the worlds climate
Divided into three parts: lower, middle and upper
Lower began 1.8mya, coincides with a sharp cooling of worlds climate
Beginning of middle is marked by sharply increased fluctuations in temp and first
appearance of immense continental glaciers that covered northern Europe 900kya,
end defined by termination of penultimate glacial period about 130kya
Upper ended about 12kya, when a warm, interglacial phase of the world climate
began, warm period has persisted into the present
Appears in the African fossil record about 1.8mya and disappears about 0.6mya
KNM-ER 3733 from Lake Turkana found 1976
Associated with Oldowan tools, recent finds suggests that H. habilis and H. ergaster
may have coexisted for almost half a million years in the Turkana basin of Kenya
Skulls differ from those of both earlier hominins and modern humans
Maintain characteristics of earlier hominins, marked barrowing behind the eyes ,
receding forehead, no chin
shared by modern humans, shorter and less prognathic face, taller skull, smaller
jaws and postcanine teeth, reduction in number of roots on the upper premolars
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