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The ages of seven samples from south wall are not in accordance with the stratigraphic order: three teeth are much younger than the other four, probably attributed to the relative higher uranium concentration and U/Th ratio in the dental tissues and significant higher gamma dose rate.

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The US-ESR results show that the ages of ten teeth from unit C III′ of the north wall are consistent in general, about 2.35 Ma.The fossil ages obtained in this work combined with paleontological evidence and new paleomagnetic results place Longgupo at the very beginning of the Early Pleistocene.Compared with other early hominid settlements, Longgupo is one of the earliest evidences of hominid settlement in China and East Asia to date.In this study, seventeen mammalian fossil teeth collected from different layers of unit C II and C III (C III′) during the 2003–2006 Sino-Franco joint excavation were analyzed by combined ESR and U-series methods, and calculated with a US-ESR model.

dose rates were remeasured in detail in 2012, in order to refine the external dose rate determination.

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