The earliest prehistoric pottery in the Qinghai-Tibetan Plateau and its archaeological implications

Remains of prehistoric human activity in the Qinghai-Tibetan Plateau (QTP) were often found exposed in the surface due to strong erosion. Thus, archaeological sites containing continuous and integral cultural remains within stratigraphic layers are rare in the plateau. The Jiangxigou site, located in the south of Qinghai Lake basin and in the northeastern margin of the plateau, are such a site with ages ranging from the early to late Holocene, i.e. from the Paleolithic to the Neolithic. Our excavation disclosed remains including more than 700 pieces of microliths, 14 pottery pieces, and other cultural relics. The oldest pottery fragments were found at the depth of 75 cm in the section, and in particular, a painted pottery piece was found at the depth of 61 cm. In this study, both luminescence (TL and OSL) and radiocarbon dating were employed to establish the chronology for these remains. Two pieces of pottery were dated using thermoluminescence (TL), another two pieces of pottery were dated by OSL, and three charcoal samples by AMS C-14. TL age of pottery piece P14 from the depth of 75 cm is 7.06 +/- 0.51 ka, making it the earliest pottery in the Tibetan Plateau. The AMS 14C age of charcoals from the same depth of 75 cm is 6805 +/- 95 Cal a BP, in agreement with TL age of P14. OSL age of pottery P12 from the depth of 60-70 cm is 6.50 +/- 0.47 ka, and OSL age of pottery P9 from 54 cm is 4.97 +/- 0.25 ka. Thus, the age of the painted pottery piece at the depth of 61 cm should be similar to 5.50 ka by interpolation, making it the earliest painted pottery in the QTP. The pottery P14 has many common features similar to that of the Yangshao culture in China. We suggest that, before 7 ka, hunters using microlithic had been living in the northeastern margin of the QTP. Since 7 ka, these native microlithic hunters had been affected by the Neolithic Yangshao culture from the Loess Plateau, which was characterized by well-developed pottery. Agricultural growers migrated from the lower elevation of the Loess Plateau to the east of the QTP, leading to profound cultural exchanges with highland native microlithic hunters. (C) 2015 Elsevier B.V. All rights reserved.