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Stratigraphic integrity of the Middle Stone Age levels at Blombos Cave

Published online by Cambridge University Press:  04 June 2019

Francesco d'Errico
Affiliation:
George Washington University, Washington DC
Lucinda Backwell
Affiliation:
University of the Witwatersrand, Johannesburg
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Summary

Abstract

Over the past twelve years Blombos Cave has yielded a well-preserved sample of faunal and cultural material in Middle Stone Age (MSA) levels. The MSA phases are separated from the < 2 thousand years (Ka) Later Stone Age (LSA) levels by a blanketing aeolian dune sand 5–50 cm thick dated at c. 70 Ka by optically stimulated luminescence (OSL). Careful examination of sediments and anthropogenically derived deposits within individual levels over the past four years has allowed us to sub-divide the MSA levels into three major phases, namely (1) a Still Bay, or M1, phase dated at c. 75 Ka by OSL and thermoluminescence, (2) a middle M2 phase provisionally dated by OSL at c. 78 Ka, (3) a lower M3 phase provisionally dated by OSL at > 100 Ka. Artefacts unusual in a Middle Stone Age context have been recovered from all three phases. These include marine shell beads, bifacial ‘laurel-leaf’ points, bone tools, engraved bone and engraved ochre in M1, and bone tools in M2. The likely symbolic significance of these finds suggests levels of cognitively modern behaviour not previously associated with Middle Stone Age people. Key issues discussed in this paper are the possibility of admixture of older and younger deposits at Blombos Cave and whether some MSA artefacts derive from the LSA levels (also see Klein, 2000: 29).

Résumé

Au cours des douze dernières années, la grotte de Blombos a livré des restes fauniques et culturels bien conservés dans les niveaux du Middle Stone Age (MSA). Les couches du MSA sont séparées de celles du Later Stone Age (LSA), datés de moins de 2 Ka, par une dune éolienne épaisse de 5 à 50cm, datée aux alentours de 70 Ka par luminescence stimulée optiquement (OSL). Un examen détaillé du dépôt a permis au cours des quatre dernières années de subdiviser les couches du MSA en trois phases principales, soit (1) une phase Still Bay ou M1 datée par OSL et thermoluminescence à environ 75 Ka, (2) une phase moyenne M2 datée provisoirement par OSL à environ 78 Ka, (3) une phase ancienne M3 provisoirement datée par OSL à plus de 100 Ka.

Type
Chapter
Information
From Tools to Symbols
From Early Hominids to Modern Humans
, pp. 441 - 458
Publisher: Wits University Press
Print publication year: 2005

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