Question: When are the fossils from Zhoukoudian from?
About the article "China", section "Prehistory".

Candidate passages:
  The bulk of the finds from the 1927-1937 excavations of Peking Man Site in Zhoukoudian, China are lost, never to be recovered, while being transported to safety.  
At Qesem Cave 12 km east of Tel-Aviv evidence exists of the regular use of fire from before 382,000 BP to around 200,000 BP at the end of Lower Pleistocene.
The large quantities of burnt bone and moderately heated soil lumps suggest butchering and prey-defleshing took place near fireplaces.
At Zhoukoudian in China, evidence of fire is as early as 230,000 to 460,000 BP.
Fire in Zhoukoudian is suggested by the presence of burned bones, burned chipped-stone artifacts, charcoal, ash, and hearths alongside "H. erectus" fossils in Layer 10 at Locality 1.
This evidence comes from Locality 1 at Zhoukoudian where several bones were found to be uniformly black to grey.
The extracts from the bones were determined to be characteristic of burned bone rather than manganese staining.
These residues also showed IR spectra for oxides, and a bone that was turquoise was reproduced in the laboratory by heating some of the other bones found in Layer 10.
At the site, the same effect might have been due to natural heating, as the effect was produced on white, yellow, and black bones.
Layer 10 itself is described as ash with biologically produced silicon, aluminum, iron, and potassium, but wood ash remnants such as siliceous aggregates are missing.
Among these are possible hearths "represented by finely laminated silt and clay interbedded with reddish-brown and yellow brown fragments of organic matter, locally mixed with limestone fragments and dark brown finely laminated silt, clay and organic matter."
The site itself does not show that fires were made in Zhoukoudian, but the association of blackened bones with stone artifacts at least shows that humans did control fire at the time of the habitation of the Zhoukoudian cave. 
Prior to today's general acceptance of Africa as the root of genus "Homo," 19th century naturalists sought the origin of man in Asia.
So-called "dragon bones" (fossil bones and teeth) from Chinese apothecary shops were known, but it was not until the early 20th century that German paleontologist, Max Schlosser, first described a single human tooth from Beijing.
Although Schlosser (1903) was very cautious, identifying the tooth only as “?
"Anthropoide g. et sp.
indet"?,” he was hopeful that future work would discover a new anthropoid in China.
Eleven years later, the Swedish geologist Johan Gunnar Andersson was sent to China as a mining advisor and soon developed an interest in “dragon bones”.
It was he who, in 1918, discovered the sites around Zhoukoudian, a village about 50 kilometers southwest of Beijing.
However, because of the sparse nature of the initial finds, the site was abandoned.
Work did not resume until 1921, when the Austrian paleontologist, Otto Zdansky, fresh with his doctoral degree from Vienna, came to Beijing to work for Andersson.
Zdansky conducted short-term excavations at Locality 1 in 1921 and 1923, and recovered only two teeth of significance (one premolar and one molar) that he subsequently described, cautiously, as “?
"Homo sp.
"” (Zdansky, 1927).
With that done, Zdansky returned to Austria and suspended all fieldwork.
News of the fossil hominin teeth delighted the scientific community in Beijing, and plans for developing a larger, more systematic project at Zhoukoudian were soon formulated.
At the epicenter of excitement was Davidson Black, a Canadian-born anatomist working at Peking Union Medical College.
Black shared Andersson’s interest, as well as his view that central Asia was a promising home for early humankind.
In late 1926, Black submitted a proposal to the Rockefeller Foundation seeking financial support for systematic excavation at Zhoukoudian and the establishment of an institute for the study of human biology in China.
The Zhoukoudian Project came into existence in the spring of 1927, and two years later, the Cenozoic Research Laboratory of the Geological Survey of China was formally established.
Being the first institution of its kind, the Cenozoic Laboratory opened up new avenues for the study of paleogeology and paleontology in China.
The Laboratory was the precursor of the Institute of Vertebrate Paleontology and Paleoanthropology (IVPP) of the Chinese Academy of Science, which took its modern form after 1949.
The first of the major project finds are attributed to the young Swedish paleontologist, Anders Birger Bohlin, then serving as the field advisor at Zhoukoudian.
He recovered a left lower molar that Black (1927) identified as unmistakably human (it compared favorably to the previous find made by Zdansky), and subsequently coined it "Sinanthropus pekinensis".
The news was at first met with skepticism, and many scholars had reservations that a single tooth was sufficient to justify the naming of a new type of early hominin.
Yet within a little more than two years, in the winter of 1929, Pei Wenzhong, then the field director at Zhoukoudian, unearthed the first complete calvaria of Peking Man.
Twenty-seven years after Schlosser’s initial description, the antiquity of early humans in East Asia was no longer a speculation, but a reality.
Excavations continued at the site and remained fruitful until the outbreak of the Second Sino-Japanese War in 1937.
The decade-long research yielded a wealth of faunal and lithic materials, as well as hominin fossils.
These included 5 more complete calvaria, 9 large cranial fragments, 6 facial fragments, 14 partial mandibles, 147 isolated teeth, and 11 postcranial elements—estimated to represent as least 40 individuals.
Evidence of fire, marked by ash lenses and burned bones and stones, were apparently also present, although recent studies have challenged this view.
Franz Weidenreich came to Beijing soon after Black’s untimely death in 1934, and took charge of the study of the hominin specimens.
Following the loss of the Peking Man materials in late 1941, scientific endeavors at Zhoukoudian slowed, primarily because of lack of funding.
Frantic search for the missing fossils took place, and continued well into the 1950s.
After the establishment of the People’s Republic of China in 1949, excavations resumed at Zhoukoudian.
But with political instability and social unrest brewing in China, beginning in 1966, and major discoveries at Olduvai Gorge and East Turkana (Koobi Fora), the paleoanthropological spotlight shifted westward to East Africa.
Although China re-opened its doors to the West in the late 1970s, national policy calling for self-reliance, coupled with a widened language barrier, thwarted all the possibilities of renewed scientific relationships.
Indeed, Harvard anthropologist K. C. Chang noted, “international collaboration (in developing nations very often a disguise for Western domination) became a thing of the past” (1977: 139). 
 Project.
Canadian paleoanthropologist Davidson Black, who was working for the Peking Union Medical College at the time, was excited by Andersson and Zdansky's find and applied to the Rockefeller Foundation for funding to undertake a systematic excavation of the site.
Funding was granted and the Zhoukoudian Project commenced excavations in 1927 under the supervision of Chinese archaeologist Li Jie.
That fall, a tooth was unearthed by Swedish paleontologist Anders Birger Bohlin for which Black proposed belonged a new species named "Sinanthropus pekinensis".
The following year Black's excavations uncovered more fossils of his new species including teeth, a substantial part of a juvenile's jaw and an adult jaw complete with three teeth.
These finds allowed Black to secure an extra $80,000 grant from the Foundation which he used to establish a research laboratory. 
Archaeological evidence suggests that early hominids inhabited China between 250,000 and 2.24 million years ago.
A cave in Zhoukoudian (near present-day Beijing) exhibits hominid fossils dated at between 680,000 and 780,000 BCE.
The fossils are of Peking Man, an example of "Homo erectus" who used fire.
The Peking Man site has also yielded remains of "Homo sapiens" dating back to 18,000–11,000 BCE.
Some scholars assert that a form of proto-writing existed in China as early as 3000 BCE.
According to Chinese tradition, the first imperial dynasty was the Xia, which emerged around 2070 BCE.
However, the dynasty was considered mythical by historians until scientific excavations found early Bronze Age sites at Erlitou, Henan in 1959.
It remains unclear whether these sites are the remains of the Xia Dynasty or of another culture from the same period.