Show simple item record Zenobia en_US Ann G. en_US Geoffrey A. T. en_US Richard G. en_US Lyn en_US 2011-01-06T09:56:28Z 2011-01-06T09:56:28Z 2008-07-01 en_US
dc.identifier en_US
dc.identifier.citation Jacobs , Z , Wintle , A G , Duller , G A T , Roberts , R G & Wadley , L 2008 , ' New ages for the post-Howiesons Poort, late and final Middle Stone Age at Sibudu, South Africa ' Journal of Archaeological Science , vol 35 , no. 7 , pp. 1790-1807 . , 10.1016/j.jas.2007.11.028 en_US
dc.identifier.other PURE: 156391 en_US
dc.identifier.other dspace: 2160/6048 en_US
dc.description.abstract Optically stimulated luminescence (OSL) measurements are reported for single grains of quartz from deposits within Sibudu rock shelter. Such measurements enable rejection of unrepresentative grains and application of the finite mixture and central age models to obtain the most reliable age estimates. Three types of single-grain equivalent dose (De) distributions were observed: one sample represented a single dose population, three samples indicated mixing between Iron Age (IA) and Middle Stone Age (MSA) deposits, and 10 samples (in addition to the three mixed samples) showed scattered distributions. The latter type resulted from differences in the beta dose received by individual grains. For these samples, the beta doses were modelled and adjusted accordingly. Ages for the 14 samples collected from MSA deposits post-dating the Howiesons Poort (HP) resulted in three age clusters, which are stratigraphically consistent with the three informally named cultural phases at Sibudu: namely, the post-HP, late MSA and final MSA. Weighted mean ages of 58.5 +/- 1.4 ka, 47.7 +/- 1.4 ka and 38.6 +/- 1.9 ka were calculated for these phases, respectively. The three phases were separated by two occupational hiatuses with durations of 10.8 +/- 1.3 ka and 9.1 +/- 3.6 ka. We hypothesise that the punctuated presence of humans at Sibudu was determined by large-scale fluctuations in climate during oxygen isotope stage (OIS) 3, which resulted in alternating wet and dry periods. Phases of occupation correspond to wet periods when fresh water was available in the Tongati River, whereas intervals of site abandonment correspond to dry periods when people were forced to migrate in search of a reliable source of fresh water. Where people migrated to, remains unresolved. (c) 2007 Elsevier Ltd. All rights reserved. en_US
dc.format.extent 18 en_US
dc.relation.ispartof Journal of Archaeological Science en_US
dc.subject post-Howiesons Poort en_US
dc.subject dose distributions en_US
dc.subject SINGLE GRAINS en_US
dc.subject single grains en_US
dc.subject MODERN HUMANS en_US
dc.subject QUARTZ en_US
dc.subject optically stimulated luminescence en_US
dc.subject BLOMBOS CAVE en_US
dc.subject CAL KYR BP en_US
dc.subject Middle Stone Age en_US
dc.subject LUMINESCENCE en_US
dc.subject South Africa en_US
dc.subject MULTIPLE GRAINS en_US
dc.subject oxygen isotope stage 3 en_US
dc.subject BORDER CAVE en_US
dc.title New ages for the post-Howiesons Poort, late and final Middle Stone Age at Sibudu, South Africa en_US
dc.contributor.pbl Institute of Geography & Earth Sciences en_US
dc.contributor.pbl Department of Welsh en_US
dc.contributor.pbl Quaternary Environmental Change Group en_US

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