2015-07-05 15:35:28 • ID: 1244
Burin-blow like tip fractures
Burin-like fractures are generally seen as DIFs. Experimentally, longitudinal macrofractures (burin-like and flute-like fractures) become more frequent as speed increases and as the impact angle decreases, while transversal (snap) fractures are more common in slow impacts. Very early examples of burin-blow impact damage on MSA-points were reported from Gademotta / (Kulkuletti); Ethiopia, dated as early as 279 k.a. years ago by Sale at al.
Douze favors the hypothesis that tools with tranchet blow scars were used as cutting tools rather than hunting weapons. Tranchet blows can be differentiated from burin-like fractures by accurate platform preparation before removal and by the recurrence of defined technical steps before before its removal from the convergent instrument.
Burin-like fractures, indicative for the use of convergent tools as projectile tips, have been observed in the South African MSA (Kathu Pan: 500 k.a.?, from several layers at Sibudu with 27% of the examined points exhibiting such fractures), the Levantine Mousterian (Tabun D and B- facies; for example: Unit IX of Tabun Cave [Tabun D] :12.5% of the Levallois points) and from the European Mousterian since MIS 6 (Bouheben, La Cotte).
Resources and images in full resolution:
- Image: mousterian-point-near-east.jpg
- Image: burin-like.jpg
- Extern Link: www.researchgate.net…263518942_A_new_chrono-cultural_marker_for_the_early_Middle_Stone_Age_in_Ethiopia_The_tranchet_blow_process_on_convergent_tools_from_Gademotta_and_Kulkuletti_sites
- Extern Link: www.researchgate.net…258530672_Earliest_Stone-Tipped_Projectiles_from_the_Ethiopian_Rift_Date_to_279000_Years_Ago