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Hoffecker, J. The spread of modern humans in Europe. Huckleberry, G. New insights into the evolution of an intervalley prehistoric irrigation canal system, north central Peru. Geoarchaeology27— Jacobs, Z. Advances in optically stimulated luminescence dating of individual grains of quartz from archeological deposits. Evolutionary Anthropology16— Ages for the Middle Stone Age of southern Africa: implications for human behavior and dispersal.

Journal of Human Evolution62— Jain, M. Towards a non-fading al in feldspar: insight into charge transport and tunneling from time-resolved optically stimulated luminescence. Radiation Measurements46— Kim, J. Quaternary Geochronology5— Lahaye, C. Lamothe, M. Natural luminescence and anomalous fading in feldspar. Radiation Measurements12— Lubinski, P. Geoarchaeologyin press. Mercier, N. OSL dating of quaternary deposits associated with the parietal art of the Tassil-n-Ajjer plateau central Sahara.

Morwood, M. Archaeology and age of a new hominin from Flores in eastern Indonesia. Nature, — Murray, A. Identifiying well-bleached quartz using the different bleaching rates of quartz and feldspar luminescence als. The integration of chronological and archaeological information to date building construction: an example from Shetland, Scotland, UK. Journal of Archaeological Science37— Pei, S. Quaternary International, 66— Petraglia, M. Middle Paleolithic assemblages from the Indian subcontinent before and after the Toba super-eruption.

Porat, N. Price, G. Dating megafaunal extinction on the Pleistocene Darling Downs, eastern Australia: the promise and pitfalls of dating as a test of extinction hypotheses. Quaternary Science Reviews30— Rhodes, E. Bayesian methods applied to the interpretation of multiple OSL dates: high precision sediment ages from Old Scatness Broch excavations, Shetland Isles.

Developments in optically stimulated luminescence age control for geoarchaeological sediments and hearths in western New South Wales, Australia. Richter, D. Journal of Archaeological Science36— Rink, W. Dating the geometric Nasca lines in the Peruvian desert. Antiquity79— Subterranean transport and deposition of quartz by ants in sandy sites relevant to age overestimation in optical luminescene dating.

Roberts, R. Luminescence dating in archaeology: from origins to optical. Haarlem 63 km. Veluwe 91 km.

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Ghent km. Bruges km. Maastricht km. Ostend km. One can observe the fence which marks the border between South Africa and Mozambique. The photograph was taken by Roxana Patrut. One can notice the ellipsoidal shape of the cavity base and the bark which covers the cavity walls. The false cavity has a large opening toward the outside.

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The photograph was taken by Stephan Woodborne. The sampling positions are shown in Fig. These segments labelled a, b, c, d or e were processed and investigated by AMS radiocarbon dating. The standard acid-base-acid pretreatment method [ 22 ] was used for removing soluble and mobile organic components. The resulting samples were combusted to CO 2via the closed tube combustion method [ 23 ].

Then, CO 2 was reduced to graphite on iron catalyst, under hydrogen atmosphere [ 24 ]. Eventually, the resulting graphite samples were analysed by AMS. AMS measurements. Fraction modern values were calibrated and converted into calendar ages with the OxCal v4. The main sampling data are displayed in Table 1. The sampling positions and directions were chosen at convenient heights between 1.

In one case sample 14however, the sampling point was higher 2. Even if, except for samples 13 and 14, the penetration of the borer in the wood was between 0. All three samples collected from the cavity 1, 2 and 5 consist of two pieces, due to the existence of one hollow part along the sample; the length of the hollow part, i. On the other hand, the deepest end of the three inner samples corresponds to the beginning of a larger hollow part around the point of maximum age in the sampling direction.

In the case of two external samples 13 and 14the penetration of the borer was more difficult and shorter in the regrowth layers triggered by the collapse of an adjacent stem. One should mention that the inner samples 1 and 5 are quasi-opposite to the external samples 11 and 15, i. Fraction modern values and radiocarbon dates of the seven samples are listed in Tables 2 and 3. Radiocarbon dates and errors were rounded to the nearest year.

Calibrated cal ages are also displayed in Tables 2 and 3. For these segments, the confidence interval of one range is, with three exceptions, considerably greater than that of the others; therefore, it was selected as the cal ad range of the sample for the purpose of this discussion. For obtaining single calendar age values of sample segments, we derived a mean calendar age of each segment from the selected range marked in bold.

Calendar ages of segments represent the difference between ad and the mean value of the selected range, with the corresponding error. Calendar ages and errors were rounded to the nearest 5 years. The accession s are included in the last column of Tables 2 and 3. The most interesting are certainly the three samples collected from the cavity, i. The photograph was taken by Adrian Patrut. The maximum age values were recorded at the sample ends, i.

As already mentioned, the total length of the cavity samples, including the estimated missing wood, suggests that the deepest end of each inner sample corresponds to another hollow part, which is located around the point of maximum age in the sampling direction. The very different old age values of the three cavity samples demonstrate that they originate from three different stems, which were labelled I, II and V, see Fig.

In the case of quasi-central normal cavities, the age values of the cavity samples decrease continuously with the distance into the wood. The increase of age values of samples collected from the cavity walls with the distance into the wood up to the point of maximum age was the first major anomaly found by us in the radiocarbon investigation of the Lebombo baobab. The only possible explanation for this finding is that such cavities, which we named false cavities, are in fact natural empty spaces which were never filled with wood between several fused stems disposed in a closed ring-shaped structure.

The second ificant dating anomaly was that the innermost rings of the cavity samples, which are adjacent to the cavity bark, were found to be several hundred years old instead of being very young.

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The radiocarbon ages of the innermost segments of the three cavity samples, i. These anomalous indicate that the stems of Lebombo baobab basically have stopped growing completely toward the false cavity over the past — yr, i. We consider that this growth stop was necessary for maintaining a stable internal architecture and preventing the collapse of the cavity and of the entire ring.

A of two segments were extracted and dated from each of the external samples 11, 13 and 15, while from the shortest sample 14 only one segment was extracted. The lithic components of the later phase of the LSA are variably dominated by backed microliths, burins, and various kinds of scrapers Brandt ; Tryon et al. Raw material transport increased not only in distance, but also in the complexity of exchange networks and exploitation patterns.

No sharp boundary can be demarcated as the end of the LSA in eastern Africa, as such lifeways continue into the early Holocene. With a humid period across eastern Africa at the onset of the Holocene came newer economic and sociocultural systems. The Stone Age of eastern Africa provides exceptional windows into the past. Its unique geography and geology make the subcontinent one of the richest in paleoanthropological resources.

Long-term research projects, and redoubled fieldwork efforts, continue to unearth these resources, furnishing our knowledge of key technological, behavioral, anatomical, and paleoenvironmental processes that have shaped our evolutionary path. Heartening examples of ancient DNA studies on human remains from the region are just starting to promise unprecedented insights into population history.

By contrast, substantial work is still needed in exploring the recent past of the region, including the dating and study of rock art. Perhaps most important of all, cultural heritage administration organs in the region must make every effort to promote capacity-building so that its rich Stone Age resources can be best studied, promoted, and conserved.

Camberlin, P. Ambrose, Stanley H.

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