Compared with other early hominid settlements, Longgupo is one of the earliest evidences of hominid settlement in China and East Asia to date.
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Simultaneous U–Pb and U–Th zircon dating using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) was performed on the ~ 0.1 Ma Toya Tephra, Hokkaido, Japan.
The method employs the concurrent measurement of Th (U–Th) ages simultaneously.
Previous dating result is questioned because of the complexity of deposition history.
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.
The U–Pb ages revealed that the Toya Tephra contains zircons with ages that cluster at ~ 0.1 Ma (0.11 ± 0.01 Ma: error shown as 95% confidence level) and xenocrysts with ages 2 Ma, the U–Th method also gave an isochron age of ~ 0.1 Ma (108 ± 19 ka or 0.11 ± 0.02 Ma; error shown as 2σ).
Therefore, both U–Pb and U–Th methods result in similar ages of ~ 0.1 Ma for the Toya Tephra, in agreement with the quartz TL age (104 ± 30 to 118 ± 30 ka) of Ganzawa and Ike (2011).
Nevertheless, the three teeth from C III of the south wall give an average age of ∼ 2.48 Ma.