by Staff Writers
Washington DC (SPX) Oct 24, 2016
Humans living in South Africa in the Middle Stone Age may have used advanced heating techniques to produce silcrete blades, according to a study published October 19, 2016 in the open-access journal PLOS ONE by Anne Delagnes from the CNRS (PACEA - University of Bordeaux, France) and colleagues.
Middle Stone Age humans in South Africa developed intentional heat treatment of silcrete rock over 70,000 years ago to facilitate the flaking process by modifying the rock properties - the first evidence of a transformative technology. However, the exact role of this important development in the Middle Stone Age technological repertoire was not previously clear.
Delagnes and colleagues addressed this issue by using a novel non-destructive approach to analyze the heating technique used in the production of silcrete artifacts at Klipdrift Shelter, a recently discovered Middle Stone Age site located on the southern Cape of South Africa, including unheated and heat-treated comparable silcrete samples from 31 locations around the site.
The authors noted intentional and extensive heat treatment of over 90% of the silcrete, highlighting the important role this played in silcrete blade production.
The heating step appeared to occur early during the blade production process, at an early reduction stage where stone was flaked away to shape the silcrete core. The hardening, toughening effect of the heating step would therefore have impacted all subsequent stages of silcrete tool production and use.
The authors suggest that silcrete heat treatment at the Klipdrift Shelter may provide the first direct evidence of the intentional and extensive use of fire applied to a whole lithic chain of production.
Along with other fire-based activities, intentional heat treatment was a major asset for Middle Stone Age humans in southern Africa, and has no known contemporaneous equivalent elsewhere.
Delagnes A, Schmidt P, Douze K, Wurz S, Bellot-Gurlet L, Conard NJ, et al. (2016) Early Evidence for the Extensive Heat Treatment of Silcrete in the Howiesons Poort at Klipdrift Shelter (Layer PBD, 65 ka), South Africa. PLoS ONE 11(10): e0163874. doi:10.1371/journal.pone.0163874
All About Human Beings and How We Got To Be Here
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement|