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A climatic context for the out-of-Africa migration

Jessica E. Tierney, Peter B. deMenocal and Paul D. Zander
A climatic context for the out-of-Africa migration
Geology (Boulder) (November 2017) 45 (11): 1023-1026


Around 200,000 yr ago, Homo sapiens emerged in Africa. By 40 ka, Homo sapiens had spread throughout Eurasia, and a major competing species, the Neanderthals, became extinct. The factors that drove our species "out of Africa" remain a topic of vigorous debate. Existing research invokes climate change as either providing opportunities or imposing limits on human migration. Yet the paleoclimate history of northeast Africa, the gateway to migration, is unknown. Here, we reconstruct temperature and aridity in the Horn of Africa region spanning the past 200,000 yr. Our data suggest that warm and wet conditions from 120,000 to 90,000 yr ago could have facilitated early waves of human migration toward the Levant and Arabia, as supported by fossil and lithic evidence. However, the primary out-of-Africa event, as constrained by genetic studies (ca. 65-55 ka), occurred during a cold and dry time. This complicates the climate-migration relationship, suggesting that both "push" and "pull" factors may have prompted Homo sapiens to colonize Eurasia.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 45
Serial Issue: 11
Title: A climatic context for the out-of-Africa migration
Affiliation: University of Arizona, Department of Geosciences, Tucson, AZ, United States
Pages: 1023-1026
Published: 201711
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 31
Accession Number: 2018-024426
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2017349
Illustration Description: illus. incl. sketch map
N12°09'00" - N12°09'00", E44°23'60" - E44°23'60"
Secondary Affiliation: Lamont-Doherty Earth Observatory, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 201806
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