The 2025 Henan Archaeological Work Achievement Exchange Conference held in Luohe, Henan on the 8th announced that the joint archaeological excavation of the Bogoria Lake site in Kenya by China and Kenya has discovered for the first time a Mode 4 stone leaf technology stone product belonging to the middle and late Paleolithic period. Kenya is one of the birthplaces of humanity and an important region for the "modern African origin theory". The Bogoria Lake Site is located in Marigat Town, Baringo County, Rift Valley Province, Kenya. In September 2025, a Chinese archaeological team jointly established by the Henan Provincial Institute of Cultural Relics and Archaeology and the Luoyang Archaeological Research Institute went to Kenya to search for Paleolithic sites dating back between 300000 and 100000 years around Lake Baringo and Lake Bogoria, and conducted a systematic excavation of the 10th site of Lake Bogoria. As one of the members of the Chinese archaeological team, Peng Shenglan, an assistant curator at the Henan Provincial Institute of Cultural Relics and Archaeology, said that by 2025, the excavation area of the 10th site will reach 64 square meters, with a depth of about 3.6 meters, and more than 5000 pieces of earth and stone products and animal fossils will be unearthed. For the first time, pattern 4 stone leaf technology stone products belonging to the middle and late Paleolithic period were discovered. Stone leaves are easy to carry and reprocess, improving the efficiency and standardization of tool making, laying the foundation for humans to adapt to diverse environments and create complex tool cultures. Peng Shenglan said that the discovered stone leaf technology products have clear stratigraphic information, which improves the cultural sequence of the Bogoria Lake site and provides important information for exploring the origin, diffusion, and relationship with early modern humans of stone leaf technology. In addition, the discovery of a large number of animal fossils in the strata of Site 10 indicates that the burial environment is conducive to fossil preservation, providing the possibility for the subsequent discovery of ancient human fossils. In addition, archaeologists have discovered 17 new Paleolithic archaeological sites around the Bogoria Lake site, discovering over a thousand stone tools, including a small stone tool manufacturing site. (New Society)