《Table 1 Elevation contrast of mammal fossils site point between Xining and its adjacent basins》

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《"Magnetochronology of Late Miocene Mammal Fauna in Xining Basin, NE Tibetan Plateau, China"》

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The Cenozoic tectonic uplifting of the Qinghai-Tibet Plateau was an important process in the tectonic evolution of China.Many scholars had tried to restrict the uplifting process of the Qinghai-Tibet Plateau using the methods of low temperature thermochronology，paleontologypalaeoclimate，sedimentary palaeogeography and sedimentary stable isotopes.It was important to restrict the uplifting of the plateau using paleontological fossils.Xu Ren et al.discussed the uplifting time of the plateau using Quercus semicarpifolia fossil（Xu Ren et al.，1973）.Previous studies showed that Laji Mountain that divided the Xining basin and the Guide basin was not formed in Eocene，so the Xining basin and the Guide basin was not independence lake basin（Fang Xiaomin et al.，2007；Wang Guocan et al.，2011）.Laji Mountain and Zhaimazari Mountain began to uplift in Miocene（23–21 Ma）.The Xining basin，Guide basin and Xunhua basin began to break up，forming separated lake basin.Since 8 Ma，Laji Mountain began to intensively uplift，so the lacustrine deposits of northern Guide basin rapidly transited into alluvial-pluvial pan deposits.The present tectonic geomorphic pattern of interior plateau was formed after another rapid uplifting occurred in 3.6 Ma.The late Miocene mammal fossils were discovered in interior Xining basin.Regional paleontological comparison results showed that the Xining basin had similar paleontological and paleoclimatic conditions with surrounding Lanzhou basin and Linxia basin.The elevations of fossil sites are difference among Hualin，Hezheng County，Linxia basin，and Xingjiawan，Yongdeng County，Lanzhou basin and this site.The most height difference more than 500m（Table 1），and the uplift height of Xining basin area is greater than Lanzhou basin area.It shows that uplift of Tibetan Plateau is different in difference regions after late Miocene.It is believed that the Qinghai-Tibet Plateau rapidly uplifted in the late Late Cenozoic（Xu Ren et al.，1973；Li Jijun et al.，1979；Molnar et al.，1993；Li Tingdong，1995；Meyer et al.，1998；Tapponnier et al.，2001；Wang et al.，2003；Zhu Dagang et al.，2006；Zhang Peizhen et al.，2006）.The discovery of mammal fossils and the results of palaeomagnetic chronology in this paper also support this view.Therefore，the discovery of the paleontological fossil supported the fact that Xining and Guide interior plateau basin were rapidly uplifted after 8.3Ma.