Bowen Meng, The University of Hong Kong, Department of Earth Sciences, Hong Kong, Hong Kong, Snezhana Zhilich, Institute of Archaeology & Ethnography Russian Academy of Sciences, Novosibirsk, Russia, Sergey Krivonogov, Novosibirsk State University, Novosibirsk, Russia and Zhonghui Liu, The University of Hong Kong, Pok Fu Lam Road, Hong Kong