• 14C Wiggle Matching of the 'Floating' Tree-Ring Chronology from the Altai Mountains, Southern Siberia: The Ulkandryk-4 Case Study

      Slusarenko, I. Y.; Christen, J. A.; Orlova, L. A.; Kuzmin, Yaroslav V.; Burr, George S. (Department of Geosciences, The University of Arizona, 2001-01-01)
      The Bayesian approach to calibration of radiocarbon dates was used to wiggle-match the "floating" tree-ring chronology from a Pazyryk culture (Scythian-type complex from Sayan-Altai Mountain system, southern Siberia) burial ground in order to estimate the calendar age of its construction. Seventeen bidecadal tree-ring samples were 14C dated with high precision (+/20-30 yr). The results of wiggle-matching show that the Pazyryk-type burial mounds in the southern Altai Mountains were created in the first part of 3rd century BC.
    • Dendrochronology and Radiocarbon Dating Methods in Archaeological Studies of Scythian Sites

      Dergachev, Valentin A.; Vasiliev, S. S.; Sementsov, A. A.; Zaitseva, Ganna I.; Chugunov, K. A.; Sljusarenko, I. Ju (Department of Geosciences, The University of Arizona, 2001-01-01)
      We propose a new method of cross-dating the wood samples based on the classical methods of spectral estimation. This method uses the average cross-spectral density as a function of the relative position of the series. Because it is not sensitive to phase shifts in data it is appropriate for cross-dating samples originating from geographically distinct areas. The accuracy of cross dating depends on the integrity of the samples used, and in the case of well-preserved wood samples, the precision of relative age comparison may reach a single year. The method was tested on two dendrochronological series from Scythian barrows of known age in Southern Siberia: the Pazyryk barrows (the Altai Mountains) and the Dogee-Baary -2 burials (Western Sayan Mountains) separated by 450 km. The analysis has shown that the Pazyryk barrow is younger by 80 +/4 yr than the Dogee-Baary -2 burials. This result is in agreement with the new chronology of Scythian-related sites suggested for Southern Siberia and Central Asia.
    • Radiocarbon Dating of Single Compounds Isolated from Pottery Cooking Vessel Residues

      Stott, A. W.; Berstan, R.; Evershed, P.; Hedges, Robert E. M.; Bronk Ramsey, Christopher; Humm, M. J. (Department of Geosciences, The University of Arizona, 2001-01-01)
      We have developed and demonstrated a practical methodology for dating specific compounds (and octadecanoic or stearic acid—C18:0—in particular) from the lipid material surviving in archaeological cooking pots. Such compounds may be extracted from about 10 g of cooking potsherd, and, after derivatization, can be purified by gas chromatography. To obtain sufficient material for precise dating repetitive, accumulating, GC separation is necessary. Throughout the 6000-year period studied, and over a variety of site environments within England, dates on C18:0 show no apparent systematic error, but do have a greater variability than can be explained by the errors due to the separation chemistry and measurement process alone. This variability is as yet unexplained. Dates on C16:0 show greater variability and a systematic error of approximately 100-150 years too young, and it is possible that this is due to contamination from the burial environment. Further work should clarify this.
    • Radiocarbon Reservoir Correction Ages in the Peter the Great Gulf, Sea of Japan, and Eastern Coast of the Kunashir, Southern Kuriles (Northwestern Pacific)

      Kuzmin, Yaroslav V.; Burr, George S.; Jull, A. J. Timothy (Department of Geosciences, The University of Arizona, 2001-01-01)
      The radiocarbon reservoir age correction values (R) for the Russian Far East are estimated as 370 +/26 yr for the northwestern Sea of Japan, and 711 +/46 yr for the southern Kurile Islands.