Introduction to Pigeon Hall: Pigeon Hall is part of the "Ape Man Cave" in the site. It was named because wild pigeons often roosted during the excavation. Its north side is made of limestone, and the roof and south wall of the cave are both hard and fossil-bearing. Breccia.
During the reinforcement of Pigeon Hall in September 2005, a cave several meters deep was discovered on the east wall of Pigeon Hall, from which more than a hundred ancient animal fossils were unearthed. Subsequently, preliminary identification by experts revealed that more than a hundred ancient animal fossils were bone fossils of swollen-boned deer and spotted deer from the same period as Peking Man. Among these bone fossils, there are three deer tooth fossils, multiple deer antlers and deer maxilla fossils, as well as a sharp "bone tool" that is suspected to have been processed.