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Title: On the limits of using combined U-series/ESR method to date fossil teeth from two Early Pleistocene archaeological sites of the Orce area (Guadix-Baza basin, Spain)
Authors: Duval, Mathieu
Falguères, Christophe
Bahain, Jean-Jacques
Grün, Rainer
Shao, Qingfeng
Aubert, Maxime
Dolo, Jean-Michel
Agustí, Jordi
Martínez Navarro, Bienvenido
Palmqvist, Paul
Toro, Isidro
Keywords: Combined U-series/ESR dating method;Fossil teeth;Fuente Nueva-3;Barranco León;Orce;Early Pleistocene
Issue Date: May-2012
Publisher: Elsevier
Citation: Quaternary Research, 2012, 77 (3), 482-491
Abstract: The combined U-series/electron spin resonance (ESR) dating method was applied to nine teeth from two Early Pleistocene archaeological sites located in the Orce area (Guadix-Baza Basin, Southern Spain): Fuente Nueva-3 (FN-3) and Barranco León (BL). The combination of biostratigraphy and magnetostratigraphy places both sites between the Olduvai and Jaramillo subchrons (1.78–1.07 Ma). Our results highlight the difficulty of dating such old sites and point out the limits of the combined U-series/ESR dating method based on the US model. We identified several sources of uncertainties that may lead to inaccurate age estimates. Seven samples could not be dated because the dental tissues had (230Th/234U) activity ratios higher than equilibrium, indicating that uranium had probably leached from these tissues. It was however possible to calculate numerical estimates for two of the teeth, both from FN-3. One yielded a Middle Pleistocene age that seems to be strongly underestimated; the other provided an age of 1.19 ± 0.21 Ma, in agreement with data obtained from independent methods. The latter result gives encouragement that there are samples that can be used for routine dating of old sites.
ISSN: 0033-5894
DOI: 10.1016/j.yqres.2012.01.003
Type: Article
Appears in Collections:Geocronología y Geología

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