Introduction to the 4th site: The 4th site of the Zhoukoudian site is located on the southern slope of Longgu Mountain, about 70 meters west of the 1st site of Zhoukoudian. The site is 46 meters higher than the Zhoukoudian River. The entrance of the cave faces south. The roof of the cave was already large when it was discovered. Partially collapsed, it was basically an open-air accumulation. It was discovered by Bulin and Li Jie in 1927. Fossils of more than 40 kinds of mammals were found in the cave, including macaques, zokors, bears, Sanmen horses, Li's wild boar, and deer. , Gurney's spotted deer, etc.
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