Long-distance transferred obsidian (IMAGE) Chinese Academy of Sciences Headquarters Caption a) scatterplot of Rb, Sr, and Zr measurements for the Shiyu obsidian artefacts and obsidian sources across East Asia; b) the four obsidian lithics from Shiyu; c) SY20-314 endscraper on obsidian. 1–2, transport wear observed at 200x and 100x magnification Credit IVPP Usage Restrictions News organizations may use or redistribute this image, with proper attribution, as part of news coverage of this paper only. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.