Photo provided by local archaeological authorities on Jan. 3, 2019 shows ochre rock paintings in a prehistoric cave site unearthed in Ngari Prefecture, southwest China's Tibet Autonomous Region. Abundant cultural relics, animal bones and ochre rock paintings composed of geometric patterns, human figures and palms and the sun were found at the Melong Tagphug cave site, believed to be at least 4,000 years old. (Xinhua)