Stone Age Plague Map (IMAGE) Max Planck Institute of Geoanthropology Caption Map of proposed Yersinia pestis circulation throughout Eurasia. A) Entrance of Y. pestis into Europe from Central Eurasia with the expansion of Yamnaya pastoralists around 4,800 years ago. B) Circulation of Y. pestis to Southern Siberia from Europe. Only complete genomes are shown. Credit Aida Andrades Valtueña. Andrades Valtueña et al. (2017). The Stone Age Plague and its Persistence in Eurasia. <i>Current Biology</i>. Usage Restrictions With appropriate credit. License Licensed 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.