Core Insights - The excavation of the Xicheng Mountain site in Shanxi Province has yielded 494 stone artifacts, providing critical new materials for studying the evolution of stone tool technology, survival behaviors, and adaptation strategies of prehistoric humans in high-altitude environments [1][2] Group 1: Excavation Findings - The site was first discovered in 2006 at an altitude of 1888 meters, with systematic excavations conducted from May to August 2022 by Shanxi University and local cultural heritage institutions [1] - Artifacts are categorized into two stratigraphic units: the lower layer contains 35 pieces dating back approximately 28,000 years, while the upper layer has 459 pieces from a slightly later cultural period [1] Group 2: Material and Cultural Insights - The majority of the stone artifacts were made from high-quality black flint, sourced from a location about 30 kilometers north of the site [1] - The site features a distinctive stone tool type known as boat-shaped cores, which share cultural similarities with the nearby Xiaochuan site, indicating a connection in fine stone tool technology [1][2] Group 3: Research Implications - The new findings from the Xicheng Mountain site contribute significantly to the understanding of fine stone tool culture in the Qinhe River basin, shedding light on the migration patterns of late Pleistocene humans and their adaptation to high-altitude environments [2]