CHOU-K'OU-TIEN

Pinyin Zhoukoudian archaeological site near the village of Chou-k'ou-tien, 26 miles (42 km) southwest of Peking, China. The site has yielded the largest known collection of fossils of the extinct hominid /a>Homo erectus-in all some 40 incomplete skeletons, which are commonly known as the Peking man fossils. Remains of anatomically modern humans (Homo sapiens sapiens) have also been excavated there. The discoveries at Chou-k'ou-tien have proved vital to advancing the study of human evolution. The hominid remains were found within a series of scree- and loess-filled clefts (inaccurately referred to as "caves") in a limestone cliff. In 1921 the Swedish geologist and fossil hunter J. Gunnar Andersson became intrigued by tales of "dragon bones" that local people found in the clefts and used for medicinal purposes. Andersson explored the clefts and discovered some quartz pieces that could have been used as early cutting tools. This discovery lent credence to his theory that the bones were actually human fossils. In 1927 the Canadian anthropologist Davidson Black retrieved a hominid molar from the site. Based on that finding, he identified a previously unknown hominid group, which he named Sinanthropus pekinensis, or Peking man. Large-scale excavations began in 1929. In the years that followed, archaeologists uncovered complete skulls, mandibles, teeth, leg bones, and other fossils from males and females of various ages. The Peking man specimens were eventually classified as a type of H. erectus that had inhabited the area between about 500,000 and 230,000 years ago during the Middle Pleistocene Epoch. Further discoveries at the site demonstrated that Peking man was fairly technologically sophisticated. Stone scrapers and choppers as well as several hand axes indicated that Peking man devised various tools for different tasks. Excavators also claimed to have uncovered ash deposits consisting of charred animal bones and stones indicating that Peking man had learned to use fire for lighting, cooking, and heating. This discovery resulted in a drastic revision of the date for the earliest human mastery of fire-from 100,000 to more than 400,000 years ago. A reanalysis of the site in 1998, however, revealed no evidence for hearths, ash, or charcoal, and it appeared to researchers that the bones and stones were charred not by human activity but by lightning-induced fire. During World War II, the more notable fossils were lost during an attempt to smuggle them out of China for safekeeping; they have never been recovered. Following the war, excavations resumed and many more fragments of H. erectus were unearthed; however, some areas remain unexcavated. Chou-k'ou-tien was placed on UNESCO's World Heritage List in 1987. In 1997, concern over the deterioration of the clefts, parts of which were in danger of collapsing, led to the establishment of a joint UNESCO-China project aimed at preserving the site and encouraging investigations there.