Did Mankind First Exit Africa 100,000 Years Ago?
Recent archaeological evidence indicates that between 130,000 to 100,000 years ago there was an exit of anatomically modern humans out of Africa into the Americas and Eastern Eurasia. This view is supported by the discovery of African artifacts in the Middle East, Brazil, and Crete, and 80,000-100,000-year-old human teeth in China. The findings suggest that humans left Africa much earlier than originally believed.
Archaeologists have now speculated that there was an Out of Africa (OoA) event around 100,000 years (or more) ago, given the presence of anatomically modern human (AMH) populations in the Levant at the Qafzeh-Skhul caves. According to Holiday (2000):
"The Qafzeh-Skhul hominids have sometimes been referred to as "Proto-CroMagnons" (e.g., Howell 1957; Vandermeersch 1996) because of their presumed similarity to the famous Aurignacian-associated hominids from Western Europe....Specifically [Brace], he notes that "in both the details of its dental and craniological size and from Qafzeh is an unlikely proto-Cro-Magnon, but it makes a fine model for the ancestors of modern sub-Saharan Africans"(p.63).
Geographical Barrier Prevents Movement Out of Africa
Alasdair Wilkins (2011) interviewed scientist Adrian Parker, who observed that:
“We need to go back to where modern humans emerged in east Africa. This occurred approximately 200,000 years ago. The period between 200,000 years ago until 130,000 years ago corresponds to a time when there was a global ice age. During ice ages, global sea levels fall as water becomes locked up in the vast ice sheets in the northern and southern hemispheres. When ice ages occur, the world's major desert belts also expand and thus modern humans would have been restricted to east Africa as the deserts of the Sahara and Arabia posed major geographical barriers that prevented movement out of the region. By 130,000 years ago, global climatic conditions changed and we moved into an interglacial, a period of warmer, global temperatures. At this time, the Indian Ocean monsoon system was forced northwards, bringing rainfall into Arabia. The previously arid interior of Arabia would have been transformed into a landscape covered largely in savannah grasses with extensive lakes and river systems.”
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Artist’s depiction of an Ice Age on Earth. ( CC BY SA 4.0 )
The warmer global temperatures, beginning around 130,000 years ago, during the interglacial period made it an ideal time for an OoA event. It appears that the first OoA exit was to Arabia, where archaeologists have found tools dating back 125,000 years.
Paleontologist Tony Marks claimed these tools came from Africa in an interview by Wilkins. In the interview Marks noted that:
"A comparison of contemporaneous Paleolithic assemblages from the north showed they totally lacked the bifacial tool production found at assemblage C. Their technique was quite different. Thus, they were unrelated. In east Africa, however, there were contemporaneous Paleolithic assemblages that not only used bifacial techniques to make some of their tools, but also used the other two techniques, blade production and radial (levaloir). An origin in east Africa for assemblage C people therefore was most plausible based on the stone tools and how they were made."
Example of bifacial silcrete point from M1 phase (71,000 BC) layer of Blombos Cave, South Africa; scale bar = 5 cm. (Vincent Mourre / Inrap/ CC BY SA 3.0 )
Early Anatomically Modern Humans in Crete and Brazil
Archaeologists believe that the OoA exit to Arabia may have been overland. The discovery of African artifacts in Crete and Brazil dating to 100 thousand years ago indicate AMH used boats to reach these areas.
Thomas F. Strasser and Eleni Panagopoulou found 2,000 stone artifacts on the southwestern shore of Crete at Plakias dating to around 125 thousand years ago. Dr. Runnels, an archaeologist working in the region said the tool kit included hand axes, cleavers, and scrapers made in the Acheulean style. Acheulean tools were made in Africa by AMH around this time.
Stone tools found on Crete are evidence of early migration by sea. ( Nicholas Thompson and Chad DiGregorio )
The Island of Crete is 200 miles (321.87 km) away from the Libyan coast. The only way these artifacts could have reached the island is by sea.