Li Yuelin, from the Argonne National Laboratory, says the inscription appears to have been created with Qin-era tools and techniques almost 2,250 years ago

The team travelled by carriage to the mountain, arrived at Zhaling Lake in what is now Qinghai province on the day of Jimao, or first in the third month, and would proceed another 150 li – about 75km – to reach their final destination, according to the stone found near the lake, at an altitude of 4,300 metres (14,100 feet).

Tong Tao, a researcher at the Chinese Academy of Social Sciences’ Institute of Archaeology, reported his findings in the state-run Guangming Daily on June 8.

“This stone carving at the source of the Yellow River is the only stone carving left by Qin Shi Huang after he unified China that still remains at its original site. It is also the most complete one and is of great significance,” he wrote

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