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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)

  • Mathieu Duval (a1) (a2), Christophe Falguères (a2), Jean-Jacques Bahain (a2), Rainer Grün (a3), Qingfeng Shao (a2), Maxime Aubert (a3), Jean-Michel Dolo (a4), Jordi Agustí (a5), Bienvenido Martínez-Navarro (a5), Paul Palmqvist (a6) and Isidro Toro-Moyano (a7)...


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.


Corresponding author

*Corresponding author at: Centro nacional de investigación sobre la evolución humana (CENIEH), Paseo de Atapuerca s/n, 09002-Burgos, Spain. E-mail address: (M. Duval).


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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)

  • Mathieu Duval (a1) (a2), Christophe Falguères (a2), Jean-Jacques Bahain (a2), Rainer Grün (a3), Qingfeng Shao (a2), Maxime Aubert (a3), Jean-Michel Dolo (a4), Jordi Agustí (a5), Bienvenido Martínez-Navarro (a5), Paul Palmqvist (a6) and Isidro Toro-Moyano (a7)...


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