“…However, a wide range of assemblages with different technologies and ages have been identified through subsequent research in the area (Gao, Wang, Pei and Chen 2013b;Li, Gao et al 2013;Pei et al 2012). Although numerous reports of the recent field operations and laboratory studies of SDG localities 1-5, 7, 8, 9, and 12 have been published (Boëda, Hou, Forestier, Sarel and Wang 2013;Gao et al 2008;Gao, Wang and Guan 2013a;Li, Kuhn, Gao and Chen 2013;Liu et al 2009;Morgan et al 2014;Nian, Gao and Zhou 2014;Pei et al 2012;Yi, Chen, Pei and Gao 2014;Wang, Pei, Ma and Feng 2007, and references therein), the chronology of major localities continues to be debated (e.g., Keates and Kuzmin 2015;Li, Kuhn et al 2013;Li, Kuhn and Gao 2015). More importantly, the technological characteristics and chronology of the various archaeological layers and localities are difficult to extract from the available literature, while some older publications are even misleading.…”