Earliest parietal art: Hominin hand and foot traces from the middle Pleistocene of Tibet

David D. ZHANG, Matthew R. BENNETT, Hai CHENG, Leibin WANG, Haiwei ZHANG, Sally C. REYNOLDS, Shengda ZHANG, Xiaoqing WANG, Teng LI, Tommy URBAN, Qing PEI, Zhifeng WU, Pu ZHANG, Chunru LIU, Yafeng WANG, Cong WANG, Dongju ZHANG, R. Lawrence EDWARDS