根据加利福尼亚大学戴维斯分校的一项新研究，一个国际考古学家小组在蒙古发现的石器表明，现代人大约在45000年前穿越欧亚大草原。这一日期比考古学家先前认为的要早一万年。

Humans migrated to Mongolia much earlier than previously believed

Archaeologists unearth stone tools made 45,000 years ago

https://www.sciencedaily.com/releases/2019/08/190816191447.htm

Journal Reference:

1. Nicolas Zwyns, Cleantha H. Paine, Bolorbat Tsedendorj, Sahra Talamo, Kathryn E. Fitzsimmons, Angaragdulguun Gantumur, Lkhundev Guunii, Odsuren Davakhuu, Damien Flas, Tamara Dogandžić, Nina Doerschner, Frido Welker, J. Christopher Gillam, Joshua B. Noyer, Roshanne S. Bakhtiary, Aurora F. Allshouse, Kevin N. Smith, Arina M. Khatsenovich, Evgeny P. Rybin, Gunchinsuren Byambaa, Jean-Jacques Hublin. The Northern Route for Human dispersal in Central and Northeast Asia: New evidence from the site of Tolbor-16, Mongolia. Scientific Reports, 2019; 9 (1) DOI: 10.1038/s41598-019-47972-1