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Editors' notes This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: fact-checked peer-reviewed publication trusted source proofread The Tibetan plateau—the world's highest and largest plateau—poses a challenge to the people who live there because of its extreme climate. In a new study, researchers have discovered stone artifacts that suggest that there were more cultural exchanges between those who lived on the plateau and those living on its perimeter. The paper is published in the journal Quaternary Science Reviews. "The Tibetan plateau has an average elevation of more than 4,500 meters, which makes Colorado seem like it is at sea level. It's amazing that people have been able to occupy this area on and off for at least the last 40,000 years," said Stanley Ambrose (MME), a professor of anthropology. "Unfortunately, very little research has been done in this big area." The plateau covers roughly four times the size of Texas and the researchers were focused on the Holocene period, which began about 11,700 years ago. "Although the world was warmer and wetter, this high-altitude location was arid and largely grassy, making it a challenging place to live in," Ambrose added. The researchers focused on a region of the plateau that supported a small human population due to its cold, dry climate and reduced oxygen levels. However, this area was prime grazing territory for yaks and gazelles. Previously it was believed that the residents developed unique strategies to survive, including making specialized stone tools and having unique genetic adaptations that helped them adapt to low oxygen conditions. "These tools were ideal because they could be reconfigured easily for different purposes. They were flexible and versatile, allowing the owners to carry a bag of bladelets that could be then shaped within seconds," Ambrose said. "Before that, everybody was running around with big knives and spears, which were durable and strong, but weren't diverse." In the present study, the researchers excavated over 700 artifacts by digging through the surface and collecting them from different sedimentary layers. They then dated these tools using Accelerator Mass Spectrometry 14C to confirm their age and composition. The researchers confirmed that the blades were from the middle-to-late Holocene. Intriguingly, they also discovered that the blades themselves were similar to the ones that had been developed in northern China, indicating that there was a long-distance cultural exchange between the Tibetan plateau and northern China through the communities that lived on the plateau's perimeter. "These artifacts were created from geological materials that were located hundreds of kilometers away, suggesting that there were large social networks that were much bigger than the largest human hunter-gatherer ranges," Ambrose said. "It also implies that these networks had long-distance interaction and communication." The researchers are now interested in expanding the size of the excavations to prove their hypothesis. "Although this is a very small excavation, there is enough to show that there were long-distance interactions. Now we need to look at larger areas and get more samples to see if we can go further back in time," Ambrose said. The study "The earliest microblade site 6800 years ago reveals broader social dimension than previous thought at the central high altitude Tibetan plateau" was published in Quaternary Science Reviews. More information: Yahui Qiu et al, The earliest microblade site 6800 years ago reveals broader social dimension than previous thought at the central high altitude Tibetan plateau, Quaternary Science Reviews (2024). DOI: 10.1016/j.quascirev.2024.108551 Journal information: Quaternary Science Reviews Provided by University of Illinois at Urbana-Champaign