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The Fossil Evidence for Human Evolution in Asia
by Dennis A. Etler
The Fossil Evidence for Human Evolution in Asia
Dennis A. Etler
Annual Review of Anthropology
Updated: October 22nd, 2012
Annu. Rev. Anthropol. 1996.25:275-301 Copyright O 1996 by Annual Reviews lnc. All rights reserved
THE FOSSIL EVIDENCE FOR
HUMAN EVOLUTION IN ASIA
Dennis A. Etler
Laboratory for Human Evolutionary Studies, University of California, Berkeley, Cali- fornia 94720
KEY WORDS: human evolution, Asia, Homo erectus, premodern H. sapiens, modern H. sapiens, regional continuity
ABSTRACT The past decade has seen a dramatic increase in the number of fossil human specimens discovered in China. A better understanding of the tempo and mode of human evolution in Asia during the Pleistocene can be gained as a result. This new evidence has important implications for understanding the course of human evolution not only in Asia but throughout the world. Major issues in human evolutionary studies such as the timing of the initial horninid dispersal event and the factors behind major transitions in the fossil record are addressed in light of these recent finds.
The human fossil record in China has greatly expanded over the past decade, allowing for a new assessment of human evolution in East Asia throughout the Pleistocene. This reassessment must, however, consider current debates about the course of human evolution worldwide. Two such debates bear directly on interpretations of the Asian fossil record. The first revolves around acceptance or rejection of evidence for an early human presence in Eurasia during the late Pliocene and basal Pleistocene. The second concerns the question of modern human origins and whether archaic hominids in various regions of the Old World played a direct role in the genesis of living people. The human fossil record in China is of decisive importance for resolving both issues.
FOSSIL EVIDENCE FOR AN EARLY HUMAN PRESENCE IN ASIA
During the 1970s it was generally accepted that human ancestors had spread to Asia by the end of the Pliocene or the beginning of the Pleistocene, -1.8-1.9 mya (16). Owing to the scarcity and fragmentary nature of early Asian human fossils, the questionable provenience of many fossil specimens, and differing interpretations of their geochronological age, this viewpoint was gradually abandoned. For the past decade the consensus has been that Homo erectus was the first hominid to enter Asia, approximately 1.0 mya (60,63). The previously held conviction that certain human fossils from Java and China were perhaps early Asian representatives of Australopithecus or Homo habilis (24, 26, 70, 78) was put aside. These remains were reinterpreted as being much younger in age and within the nominal range of variation to be expected in H, erectus (42, 49, 135).
New Material Attributed to Plio-Pleistocene Hominidae in Asia
Due to recent fossil discoveries and the redating of older material, the contention that H. erectus was the first hominid to disperse into Eurasia, and at a relatively late date, has itself come under scrutiny. The most significant revision concerns reevaluation of the age of early human fossils from Sangiran and Perning in Java, which have again been dated to the Plio- Pleistocene transition (77). This time, however, the redated remains include not only specimens attributed to the supposedly H. habilis-like taxon Homo modjokertensis (78), but others that have long been considered typical exam- ples of H. erectus. In addition to this material, several very poorly preserved gnathic and cranial remains, attributed by some to an enigmatic australopithe- cine-like taxon, Meganthropus palaeojavanicus, have been found in similarly ancient deposits. These fossils seemingly fall outside the morphological pa- rameters set elsewhere by H, erectus (24,79). The situation has, consequently, reverted to one that prevailed two decades ago, when a diversity of specimens representing multiple grades or clades of hominid were tentatively recognized from the earliest Pleistocene of Java. Then as now, however, there is no agreement about the true age and actual affinities of all the Javan material (Figure 1).
Additional finds on the Eurasian mainland have also come to light that argue for an older age for early hominids in Asia. The distinctive Dmanisi mandible from the Republic of Georgia, on the southwestern flank of Asia, has been dated to 1.8 mya (25), while a hominid-like lower jaw fragment from Wushan in Sichuan has recently been dated to 1.8-2.0 mya (35). Two hominid incisors from Yuanmou in Yunnan, known since the 1960s (32), have also been dated to the basal Pleistocene (64). In addition to the above paleontologi-
cal specimens, archeological remains from Riwat in Pakistan have been dated to the late Pliocene (18), while Xiaochangliang in the Nihewan basin of Hebei and other early Paleolithic sites in north central China have been dated to the earliest Pleistocene (1.6 mya) (38).
Although critics maintain that evidence of the sort enumerated above is qualitatively no better than in the past, and hence does not warrant recon- sideration, there seems at present a much greater willingness to accept all or most of it. Africanists, who have long resisted the idea of a Plio-Pleisto- cene human presence in Asia, have acquiesced in the hope that evidence for a dispersal of early Homo into Asia before the advent of more advanced forms in Africa will buttress their claim that its likely descendant, Asian H. erectus, was a side-branch on the human evolutionary tree uninvolved in the African origins of later human beings (17). Asianists are more than happy to accept the new evidence, as it confirms their long-held belief that Asia, like Africa, was from the outset a major theater of human evolution and that perhaps H. erectus, after all, really did evolve in Asia, eventually spreading back to Africa to replace the australopithecines and other assorted early homi- nids (103). Nevertheless, what all these remains in Java, China, and elsewhere actually represent, and how they relate to the emergence of the genus Homo worldwide, still requires much further study and the recovery of much more complete material.
Evidence for Early-Pleistocene Homo erectus in China
GONGWANGLING, LANTIAN, SHAANXI Other than the Wushan and Yuanmou specimens mentioned above, a damaged partial cranium from Gongwangling, Lantian county, Shaanxi (96), is the earliest substantial hominid specimen known from China. An early-Pleistocene age of 1.15 mya, recently proposed by An & Ho (2), based on correlation of the local loess/paleosol column at the hominid-bearing site with the worldwide oxygen isotope scale, is consistent with both the cranium's faunal associates and the morphological character of the specimen. In its preserved morphology, especially its small cranial capacity (-780 cm3), the robusticity and double-arched shape of its supraorbital torus, its high degree of postorbital constriction, the oblique orientation of its inferior zygomaxillary border, and low placement of the root of the zygomatic process, the Gongwangling cranium appears to be quite similar to material attributed to early H. erectus (also called Homo ergaster by some) from the early Pleistocene of East Africa (102), Java (77, 79), and perhaps Western Europe (7), and to deviate significantly from the more derived pattern of classic H. erectus seen at Zhoukoudian (23, 122).
FOSSIL EVIDENCE FOR MIDDLE-PLEISTOCENE HOMO ERECTUS IN CHINA
Distribution in Space and Time The fossil record of middle-Pleistocene H.erectus in China has been amply supplemented since the early 1960s when the only known remains were the lost but not forgotten fossils from Zhoukoudian (Chou Kou Tien), i.e. the original Peking Man material (39). Middle-Pleistocene specimens of H. erectus are now known to occur not only at Zhoukoudian, but at Chenjiawo in Lantian county, Shaanxi; Quyuan River Mouth in Yunxian county, Hubei; numerous other localities in the hilly regions west of the Central China Plain in western Hubei and southwestern Henan and Shaanxi; Qizianshan in Yiyuan county, Shandong; Longtandong in Hexian county, Anhui; and perhaps at Tangshan on the outskirts of Nanjing, Jiangsu, although this latter material is still under study and may represent a premodern form of Homo sapiens (Figure 2). The dating of the remains mentioned above shows that the temporal range of H. erectus in China was considerable, spanning at least 700,000 years (see Table 1 for list of specimens and dates). All the above discoveries go a long way toward helping to elucidate pa- rameters of variation within H. erectus, as well as the magnitude of evolution- ary transformation that affected this hominid lineage during its long history in East Asia. It is in the context of this more complete record of H. erectus in China that its status and relationships to other middle-Pleistocene human be- ings in various parts of the Old World should be evaluated. What follows is a more detailed look at some of the sites and specimens mentioned above.
Major Sites of Middle-Pleistocene Homo erectus in China
ZHOUKOUDIAN, BEUING Since 1949 great advances have been made in study of the Zhoukoudian site. These advances culminated in the late 1970s and early 1980s with extensive geochronological and geomorphological work carried out by various institutes of the Academia Sinica (1 13). Syntheses of the geochro- nological studies indicate that the site was intermittently inhabited by groups of
H. erectus from -440-580 kya and perhaps as late as 240 kya (33, 140, but see 1). Between 1921 and 1966, a total of 6 complete or near-complete skull-caps, 12 cranial fragments, 15 mandibular pieces and 157 teeth (including 84 sock- eted and 73 isolated) were recovered at Zhoukoudian. Postcranial finds in- cluded seven femoral pieces, one fragment of a distal tibia, three humeral pieces, one clavicular fragment, a fragment of an atlas, and one lunate. Nearly
all this material was lost during World War 11, although an excellent set of casts still survives (53). The only known existing specimens of H.erectus
Figure 2 Important East Asian sites bearing human fossil remains (All sites located in China except Nmada, India, and Minatogawa, Okinawa, Japan). Table 1 Im~ortant hominid fossil remains from chinaa
Site name, county, province
Longgupo, Wushan, Sichuan
Danawu, Yuanmou, Yunnan
Gongwangling, Lantian, Shaanxi Longgudong, Jianshi, Hubei Donghecun, Luonan, Shaanxi Quyuanhekou, Yunxian, Hebei Chenjiawo, Lantian, Shaanxi
Longgushan, Yunxian, Hubei
Bailongdong, Yunxi, Hubei
Xinghuashan, Nanzhao, Henan
Loc. 1, Zhoukoudian, Beijing
Qizianshan, Yiyuan, Shandong
Longtandong, Hexian, Anhui
Tangshan, Nanjing, Jiangsu Jinniushan, Yingkou, Liaoning
Tianshuigou, Dali, Shaanxi Wanlongdong, Changyang, Hubei Dingcun, Xiangfen, Shanxi
Yanshan, Chaoxian, Anhui
New Cave, Zhoukoudian, Beijing Premodern H. sapiens Tooth
Attribution Early Homo?
Mand. frag., upper incisor Two incisors, tibia1 diaphysis Partial cranium Teeth Tooth Two crania Mandible
Five crania, mandibles, teeth, postcrania
Cranial frags., teeth
Calvaria, cranial frags, mand. frag., teeth Two partial crania
Age x 103 1,800-2,000
700-1 ,I 50
700-1 ,I 50
160-220 135-175 130-290 120-140 102-191 100-125
28 28 11-29
Premodern H. sapiens Cranium, partial skeleton Premodern H. sapiens Cranium Premodern H. sapiens Maxilla
Premodern H. sapiens Assorted teeth, infant parietal Premodern H. sapiens Occipital, maxilla
Miaohoushan, Benxi, Liaoning Shiziyan, Maba, Guangdong Yanhuidong, Tongzi, Guizhou Xujiayao, Yanggao, Shanxi
Wuguidong, Jiande, Zhejiang
Salawusu, Inner Mongolia
Shiyu, Shuoxian, Shanxi
Upper Cave, Zhoukoudian,
Beijing Tongtianyan, Liujiang, Guangxi
Huangshanxi, Ziyang, Sichuan Premodern H. sapiens Teeth, femoral shaft Premodern H. sapiens Partial cranium Premodern H. sapiens Assorted teeth Premodern H. sapiens Cranial elements, max.,
teeth, mand. frag. Premodern H. sapiens Tooth
Modern H. supiens Modem H. sapiens
Modem H. sapiens Modern H. sapiens Modem H. sapiens Modem H. sapiens
Cranial elements, man- dible, postcrania Skull and skeleton Occipital Three crania, mandi- ble, postcrania Cranium, partial skeleton Partial cranium
a~ttribution is by author. Dates include all recently published figures. See text for details and referenrec All nthpr fnccil rn~teri~lof modem H saniens in China is dated to the terminal Pleistocene--early Holocene (-8-1 2 kya).
from Zhoukoudian include a few teeth retained from the original excavations; a limb bone fragment, teeth, and a lower jaw found in the 1950s (97,98); and a frontal and occipital found in 1966 (66), which fit a previously known skull- cap collected in 1934.
There is such an extensive and detailed literature on H. erectus from Zhouk- oudian, written by both Davidson Black (4) and Franz Weidenreich (84-87, 89, 90), that only a brief review of the site's human fossils can be attempted in these pages. It is important, however, to summarize some of their salient morphological features as they have long been the standard of comparison for middle-Pleistocene hominids worldwide (see Figure 3).
Overall, the cranium is characterized by an endocranial volume approxi- mately two thirds that of modern human beings, great cortical bone thickness, low cranial vault height, and a broad cranial base. The frontal bone has mas- sive, horizontally oriented supraorbital tori; a distinct trough-like posttoral sulcus; pronounced postorbital constriction; and a sloping forehead. The parie- tal~are foreshortened and slope sharply toward the midline of the skull, which produces a narrow interparietal distance. This, in combination with the mas- sively built basicranial superstructures, produces a bell-shaped transverse cra- nial vault contour. The temporal bone is rhomboid-shaped with a low, straight superior border and well-developed crests and ridges on, and superior to, the mastoid process. The occipital bone is sharply angulated with a low, long, and broad plane for the attachment of the nuchal musculature and a constricted upper squamous portion. The cranium's greatest length extends from glabella to the midpoint of the transverse occipital torus, which in turn extends laterally to the supramastoid region. The lower jaw is robust, well buttressed, and chinless with a strongly everted gonial angle, a broad ascending ramus, and a well-excavated masseteric fossa. Other distinctive features of the cranial vault and base include a well-developed system of bumps and ridges on the external surface of the cranium; a thick, elongate, and tubular tympanic bone oriented perpendicular to the midline of the skull; a deep, narrow mandibular fossa; and a low degree of basicranial flexure. There are also distinctive dental traits (most significantly the shoveling of the upper incisors) and postcranial features (robust limb bones characterized by thick walls and platymeria, that is, by transverse flattening of the bone shaft), all of which have come to characterize the specimens from Zhoukoudian and serve as benchmarks for defining H.
In retrospect, however, the remains of H. erectus at Zhoukoudian are rela- tively homogeneous when compared with more recently discovered specimens of middle-Pleistocene Chinese hominid, which tend to differ to a greater or lesser extent from the pattern described above. Actually only the H. erectus material from Yiyuan in Shandong province (52), which includes cranial,
postcranial, and dental remains, shows pervasive, all-around similarity to specimens of H. erectus known from Zhoukoudian. All the features mentioned above do appear, however, to one extent or another, in many other Chinese fossils that both pre- and postdate the Zhoukoudian site (23).
QUYUAN RIVER MOUTH, YUNXIAN, HUBEI The two new Yunxian crania (44), recently dated by paleomagnetism and ESR to the late early or early middle Pleistocene (-600-800 kya) (8, 127), are very important, being the most complete specimens of H. erectus ever found on the Asian mainland. In a number of features-primarily their extremely large cranial and facial dimensions, lack of well-expressed ectocranial buttressing features, elevation of the upper margin of the temporal squama, swept-back orientation of the supraorbital tori, and reduced postorbital constriction-they are quite distinct from Zhoukoudian H. erectus and recall Western archaics. They preserve, however, many other features common to H. erectus at Zhoukoudian, including the overall shape of the cranial vault (it is very long, low, and pinched to the rear), a long and broad occipital nuchal plane, the low placement of greatest cranial breadth, and the discrete morphology of the cranial base, which is structurally indistinguishable from that of classic H. erectus and quite different from that found in archaic H. sapiens and later more modern-looking human beings (see Figures 3 and 4; 23, 44, 45). In keeping with the presence of the above erectus-like characteristics, the Yunxian crania lack many features thought to be diagnostic of Western archaics, such as a gracilized and flexed cranial base, transverse parietal expan- sion, opening up of the posterior occipital angle, constriction of the lower scale and expansion of the upper scale of the occiput, and elevation of the point of greatest cranial breadth up the cranial sidewall to the level of the parietals, which produce a more rounded and globular transverse cranial vault contour. Further distinguishing Yunxian from Western archaics is the presence of flat, anteriorly oriented, laterally flaring and elevated cheek bones; a horizontally oriented inferolateral zygomaxillary border; and a canine fossa. The above facial features represent a trait complex universally seen in fossil and modem Asians (43,56, 61, 62, 100). Middle-Pleistocene Western archaics such as Petralona, Arago, and Atapuerca in Europe, and Bodo and Kabwe (Broken Hill) in Africa exhibit a very different facial morphology characterized by a low origin of the zygo- matic root, parasagittal orientation of the zygomaxillary facies, an oblique inferolateral zygomaxillary border, and lack of a canine fossa. These features of Western archaics are later elaborated upon by Neandertals, which produced a facial topography that is at the opposite extreme from the overall morphological pattern seen in East Asia.
The amalgam of features seen in the Yunxian crania opens up a new window on human variation during the middle Pleistocene of Asia. In some
HUMAN EVOLUTION IN ASIA 285
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ways this amalgam tends to narrow the morphological gap between eastern H. erectus and Western archaics. In other ways the Yunxian material clearly aligns with specimens of Asian H. erectus and all later Asian people. Given their unexpected mix of features, the Yunxian crania also raise questions vis ii vis the long-standing practice of using the Zhoukoudian remains as the sole yardstick for defining the morphology of H. erectus (for examples, see 3, 74, 101, 137). In addition, Yunxian's early geochronological age, confirmed by the archaic nature of its prolific associated fauna, combined with its in situ archeological remains, makes it one of the most important and unique paleoan- thropological sites in all Asia.
CAVE AND OPEN-AIR SITES OF CENTRAL CHINA The Quyuan River Mouth, Yunxian, hominid site is not an isolated occurrence. Dental remains from nearby sites in central China have also been attributed to H. erectus (65, 67, 11 1, 114, 126, 135). These, plus the Lantian mandible from Chenjiawo (93, seem to predate or slightly overlap in time material recovered at Zhoukoudian (2, 80). While closely akin morphologically to homologous remains from Zhoukoudian, many of the isolated teeth found in Hubei share the same large size associated with dental remains from the Quyuan River Mouth and Hexian sites. All these finds tend to extend the range of variation of both metric and nonmetric dental and gnathic features of H. erectus in China.
LONGTANDONG, HEXIAN, ANHUI The Hexian skull-cap and associated frag- mentary cranial, mandibular, and dental remains (36, 105, 112), while basically similar to those from Zhoukoudian, differ in some clear ways. The dentition is extremely large, far outstripping homologues from Zhoukoudian in overall size. The skull-cap differs from Zhoukoudian specimens in details of supraorbital construction, less well-expressed ectocranial buttressing, the high curvature of the temporal squama, a significant increase in greatest cranial breadth, and a reduction in postorbital constriction, all features somewhat analogous to those seen in Yunxian and such Javanese crania as Sambungmachan.
It has been assumed by most investigators that the cranial features enumer- ated above are progressive in nature, although the appearance of similar traits in the reportedly more ancient Yunxian crania suggest they may be more readily attributed to intraspecific variation. The original assumption that the Hexian skull-cap represents an advanced form of H. erectus was based on its seemingly late age and similarity in certain respects to Skull 5 from the upper layers at Zhoukoudian, Locality 1 (66), also considered to be relatively younger in age than other H. erectus fossils recovered in China. Both could, however, be older than initially suggested. The Hexian site has recently been dated to 300 kya by ESR (34), while a new set of Uranium-series assays date
the upper layers at Zhoukoudian to -400 kya (72). Other tests at both sites, however, record younger ages in the neighborhood of 200 to 250 kya (10, 33, 130, 140). If the younger dates are accepted there is the possibility that late-oc- curring H. erectus in China may in fact overlap in time early premodern H. sapiens as known from Yingkou (Jinniushan) in Liaoning and perhaps else- where (9, 11). A more conservative viewpoint is that there was a relatively swift, yet mosaic, transition from H. erectus to premodern human beings in China, the timing of which can not yet be resolved by available dating tech- niques (20). In this case it would be virtually impossible, as well as counter- productive, to sort widely variable hominid specimens into arbitrary time successive taxa (i.e. H. erectus vs premodern H. sapiens).
TANGSHAN, NANJING, JIANGSU The In0S.t recent human fossil discovery in China consists of two partial crania, initially attributed to H. erectus, excavated in March 1993 from Huludong, a karst cave on the slope of Tangshan Hill on the eastern outskirts of Nanjing, Jiangsu. This is the first such discovery south of the Changjiang (Yangtze) River. The first cranium, currently under study by Prof. Lii Zun'e of Peking University, is reported on below. No information is yet available on the second.
The specimen preserves a complete frontal, the two parietals, both nasals, and a disassociated portion of the occipital. The left orbit is preserved intact, as are portions of the left maxilla and zygomatic. It is described as very similar in many features to H. erectus from Zhoukoudian (54). The cranium has a low, flat forehead and a continuous, horizontally oriented supraorbital torus with a distinct posttoral sulcus. The occipital bone has a short upper scale and long lower scale, a conservative H. erectus-like trait. Both meet at a relatively acute angle. There is a clearly delimited, horizontally oriented occipital torus sur- mounted by an indistinct supratoral sulcus. Cortical bone is much thicker (-10 mm) than in modern human beings. As in other archaic Chinese crania the cheek bones are anteriorly oriented and laterally flaring. The cranium is thought to represent a young adult female based on its overall size, the degree of sutural closure, and the relative weakness of the supraorbital and other ectocranial structures.
The mammalian fossils associated with the human remains represent a typical northern Chinese middle-Pleistocene fauna similar to that recovered at Zhoukoudian, Locality 1 (125). It differs from the nearby Hexian fauna in laclung common southern Chinese elements such as Ailuropoda (giant panda) and Megatapirus (giant tapir). The fauna apparently represents a southward dispersal of Palaearctic elements during a cold, glacial phase or subphase of the middle Quaternary. The morphological character of the human cranium likewise suggests closer affinities to H. erectus as known from Zhoukoudian rather than Hexian, even though the Hexian locality is much closer (-100 km).
Given the increased sampling of H. erectus in China over the past two decades it appears that no simple evolutionary trend is discernible (but see 136). Rather than resolving the argument for or against stasis in H. erectus during its long career in Asia (69, 91a), the new evidence seems to hint at much greater between-group variation than was initially perceived. Further study is surely warranted on whether discernible local variants of H. erectus can be recognized in East Asia and on the implications of this possibility for our understanding the course of human evolution during the middle Pleisto- cene in China.
FOSSIL EVIDENCE FOR PREMODERN HOMO SAPIENS IN CHINA
It was only with the resumption of paleoanthropological research in China in 1949-after the loss of the Zhoukoudian fossils during World War 11-that the fossil record of premodern H. sapiens in East Asia began to accumulate. In 1953 the first trace of a fossil hominid more advanced than H. erectus but not fully modern was found at Dingcun, Xiangfen county, Shanxi province (59). While archeological and faunal remains recovered at Dingcun were relatively abundant, the fossil hominid material consisted of only three teeth-the upper right incisors and a lower right M2 of a juvenile. In 1956 additional, meager remains of premodern H. sapiens were recovered at Wanlongdong, Changyang county, Hubei, with the retrieval of a maxillary fragment retaining P3 and M1 (12). This was followed relatively quickly by the discovery of a partial cra- nium at Maba, Qujiang county, Guangdong, in 1958 (99). It was not until 1976, however, that more material of premodern H. sapiens was forthcoming from China, with the discovery of the important but little heralded Xujiayao remains from Yanggao county, Shanxi (14, 104, 107). This was followed in the 1980s by the excavation of a nearly complete fossil cranium from Tian- shuigou, Dali county, Shaanxi (117); a cranium and partial skeleton from Jinniushan, Yingkou county, Liaoning (50, 51, 110); and cranial remains from Yanshan, Chaoxian county, Anhui (123, 124). In addition to the relatively complete specimens enumerated above, several teeth attributed to premodern
H. sapiens or a late-occurring form of H. erectus are known from Yanhuidong, Tongzi county, Guizhou (106, 109). Isolated dental remains have also been produced from the New Cave (Xindong) at Zhoukoudian (28); Miaohoushan, Benxi county, Liaoning (55); and Wuguidong, Jiande county, Zhejiang (30).
The above material, when coupled with the expanded record of H. erectus and early modern H. sapiens that has accumulated in China over the past two decades, begins to lay the basis for a more thorough understanding of the course of human evolution in East Asia throughout the Pleistocene.
The Timing of Premodern Homo sapiens in China
The transition in China from H. erectus to what has been called "early" H. sapiens by Chinese workers, but which I prefer to call premodern H. sapiens, seems to have commenced -300 kya, somewhat later than the first occurrence of archaic H. sapiens in Europe and Africa and somewhat earlier than the appearance of Neandertals in Europe and the Near East. Fragmentary remains of premoderns persist until -100 kya when there is an abrupt decline.
With the recovery of the specimens mentioned above, the fossil record of late middle-Pleistocene to early late-Pleistocene premoderns in China is now nearly as dense as the record of middle-Pleistocene archaics in Europe and Africa. Moreover, many of the fossil-bearing sites have been dated by Ura- nium-series assays (lo), and the dates so obtained can serve as a broad schema for placing them into a coherent geochronological framework. Problems atten- dant to Uranium-series dating must, however, be considered when evaluating the results (71) (see Table 1 for list of specimens and dates).
The Morphological Character of Premodern Homo sapiens in China
The post-H. erectuslpremodern H. sapiens fossil human material from China is of a mixed character (see Figure 4). There is clearly a more modern overall pattern to the cranial remains known from Dali, Jinniushan, Chaoxian, Xu- jiayao, and Maba when compared with any of the H. erectus skulls discussed earlier. This is reflected primarily in cranial features such as transverse parietal expansion, resulting in a more rounded, globular braincase; a robust but fully modem temporal morphology (i.e. a high, arcuate squamosal border and a deep parietal notch); thinning and anteroposterior foreshortening of the tym- panic plate; presence of a fully ossified styloid process; development of a highly flexed cranial base; and a rounding of the posterior portion of the skull associated with a diminution of the occipital torus and the separation of opis- thocranion (the point of greatest posterior cranial projection) from the toral midpoint. These important aspects of cranial morphology now appear more similar to specimens of archaic H. sapiens known from Europe and Africa (115, 120, 121). In other features, including various facial and cranial vault dimensions and indices, Chinese premodems are clearly transitional between
H. erectus and modem H. sapiens. Premodern crania in China, nevertheless, also preserve a number of broadly archaic characteristics such as robust and laterally continuous brow ridges, sloping foreheads, and low cranial vault height in association with distinctly erectus-like traits, such as a well-ex- pressed system of ectocranial buttresses (in particular the development of frontal bossing), and many discrete characters of the cranial base (e.g. the shape and size of the mandibular fossa in Dali, the morphology of the petrous pyramid in Xujiayao, etc), showing a clear derivation from predecessor popu- lations of East Asia (22). Moreover, according to dentition and postcranial anatomy there seems to have been little if any change from the pattern estab- lished by H. erectus (86, 89).
Dental similarities are exemplified by remains from Tongzi in Guizhou (106, 109), Miaohoushan in Liaoning (55), Xujiayao in Shanxi (14), and Chenggong in Yunnan (68)-all dated to the late middle or early late Pleisto- cene-that are virtually indistinguishable from those of H. erectus as known from Zhoukoudian and other sites in China. Of even greater significance, however, is the study of the evolutionary history of Asian dentitions pioneered by Turner (78b) who recognizes an East Asian "sinodont dental pattern" characterized by a number of discrete traits (including shovel-shaped upper incisors, reduction or loss of M3, and deflecting wrinkle on lower Mls, etc) said to have evolved from a simpler southeast Asian "sundadont pattern," which lacks these features. Turner hypothesizes that the sinodont pattern emerged only within the past 30,000 years, following dispersal of sundadont populations into the Chinese heartland. This theory is, however, contradicted by the high incidence of strong maxillary central incisor shoveling, a key sinodont feature, and the common occurrence of nearly all other characteristic sinodont traits, in Chinese fossils that extend as far back in time as H. erectus (47a). Sinodonty therefore has deep roots in Asian prehistory. Rather than being a relatively recent phenomenon it is actually one of the most persuasive pieces of evidence for local evolutionary continuity in East Asia.
East Asian postcranial remains of premodern H. sapiens from Jinniushan (50, 51), and early modem H. sapiens from late-Pleistocene sites such as Qingshantou in Jilin (128), Liujiang in Guangxi (94), Minatogawa in Okinawa (41b), and Laishui in Hebei (ZE Lii, personal communication) also exhibit features of local evolutionary continuity. Specimens from all these sites retain the overall characteristics of limb bones seen in Chinese H. erectus (89) in contrast to the postcrania of early moderns from the Near Eastern sites of Qafzeh and Skhul and the Australian site of Kow Swamp (in Australia), which are essentially modem in overall appearance (41a, 78a).
Premodern and early modern Chinese are closely linked in many other ways besides dentition and postcrania. For instance, archaic cranial features such as extreme vault thickness, a robust but relatively modern-looking tym- panic, a recurved but strongly flexed occipital, and a simple pattern of blood supply to the brain, are retained in many early modern and even Holocene specimens from China (138). Examples include the Shiyu occipital from Shanxi (13), dated to -28 kya, which is very similar in construction to homolo- gous material from Xujiayao; parietals from Hetao in Inner Mongolia, dated to 35+ kya (lo), which retain an archaic meningeal pattern similar to that seen in
HUMAN EVOLUTION IN ASIA 291
Chinese H. erectus and premodern H. sapiens (93); and the archaic character of the frontal associated with the 28,000-year-old Laishui cranium, to be discussed below.
On the other hand, the Jinniushan cranium shows derived features associ- ated with later H. sapiens, particularly in the thinning of the cranial vault bones and an increase in cranial capacity (-1390 cm3). In fact, as in Africa, a mosaic transition from archaic to premodern and later early modern people can be documented in China, with individual specimens differentially preserving various heritage features of East Asian H. erectus in combination with derived features that presage later more modern H. sapiens (22, 23).
FOSSIL EVIDENCE FOR MODERN HOMO SAPZENS IN CHINA
Between approximately 25 and 100 kya, a crucial period in human evolution when modern H. sapiens became established throughout the Old World, the trend of incremental accretion of more and more modern features in the Chi- nese fossil human record continues unabated. During this period, recognizable differences between northern and southern Chinese also become apparent (21), although how far back in time this division may go is at present unclear.
Fossil Evidence for Late-Pleistocene Human Evolution in Northern China
The earliest modern human remains in northern China come from Salawusu (Sjara-osso-gol) in the Hetao (Ordos) region of Inner Mongolia, known since the 1920s for a late Paleolithic culture characterized by minuscule flaked tools made on small pebbles (47). Human fossil-bearing sites in the region have recently been dated to between 35 and 65 kya by Uranium-series assays (10). The human specimens include two complete frontal bones; frontal, parietal, and occipital fragments; two partial mandibles; and an assortment of limb bones (19, 93). The frontals, both representing juvenile individuals, are fully modern in appearance, with gracile brows and rounded superior orbital mar- gins. They have, however, a frontal curvature index intermediate between modem Chinese and H.erectus from Zhoukoudian, which indicates a rela- tively sloping forehead. The parietals are moderately thick with cortical bone rather than diploe making the greater contribution, similar to the condition in more archaic Chinese and at variance to that seen in modern human beings. In overall proportions, however, they approach the parietals of modern Chinese to a greater degree than do those from Xujiayao. The more complete of the lower jaws is that of a juvenile. It is robust and well-buttressed with a poorly developed chin. As there are no well-preserved mandibles of premodern H. sapiens yet known from China, it can only be compared with those of H.
erectus. In this respect the jaw is said to possess discrete traits and overall proportions similar to those seen in specimens from Lantian, Zhoukoudian, and Hexian, although none of these falls beyond the known range of modern human variation (19). All in all, the Hetao remains, although without question fully modern, retain a number of plesiomorphic (i.e. ancestral) features that help establish their phylogenetic relatedness to earlier more archaic Asians.
A nearly complete hominid skeleton from Laishui, Hebei, discovered in 1988-briefly mentioned above and currently under study by Lii Zun'e-will undoubtedly play a significant role in discussions of human evolution in China when fully described. A cast of the specimen is on public display at Peking University's Sackler Museum of Archeology. The skull is considerably more robust than the Salawusu remains, particularly in regard to its projecting supraorbitals, which preserve an essentially archaic morphology. These are associated with a relatively sloping forehead and a cranial vault, base, and face that are otherwise comparatively modern. Dated to 28 kya, this material helps fill in the gap between late premoderns such as Xujiayao and late early mod- erns, such as the Upper Cave specimens from Zhoukoudian (88, 116). Future discoveries of this sort will assuredly further document the in situ evolution of archaic Asians toward a more modern morphology. Other recent finds dated to the late-Pleistocene of northern China, including a partial cranium from Xu- jiafenshan in Huanglong county, Shaanxi (82); portions of a skull cap from Niujiagou, Jingchuan county, Gansu (48); and an occipital fragment from Shiyu, Shanxi (13), differentially preserve a number of archaic features such as extreme vault thickness, mounding of bone along the sagittal suture, a flexed occipital angle, and a salient occipital torus that harken back to earlier more archaic human remains from China.
It has been argued by some that the specimens discussed above show closer affinities to early Western modems than to living Chinese (75), which suggests that the racial differentiation of extant East Asians began after the arrival of H. sapiens from further west. It is thus intimated that earlier, more archaic people from China had little or no direct impact on the evolution of the modem Chinese morphotype. For instance, Skull 101 from the Upper Cave at Zhoukoudian has been shown by multivariate, morphometric analysis to be an outlier when compared with modem Asian populations (41) and most similar to early Holocene crania from Kenya (5,31), and crania such as Huanglong are said to show closer metric affinities to early modems in Europe than to living Chinese (81). This is, however, also the case among latePleistocene modems in other parts of the world. Border Cave, an early modern specimen from South Africa, and the late-Pleistocene Omo 1 cranium from Ethiopia, when compared multivariately with modern Africans, likewise appear to be outliers, showing no demonstrable affinities to any extant African population (15), while late-Pleistocene Australians ally with contemporaries from Europe and North Africa (29). This phenomenon is almost certainly a function of the general robusticity of the specimens under consideration and their retention of plesiomorphic traits lost in their more derived descendants. The studies men- tioned above certainly demonstrate that early moderns in China show overall "grade" affinities to early modems in Europe and Africa, as should be ex- pected. What the northern Chinese specimens discussed above also clearly demonstrate is the morphological continuity between archaic and modern hu- man beings in China. This continuity, moreover, is not solely contingent on the persistence of discrete regional traits through time but rests on the documenta- tion of a series of mosaic transformations that show a steady temporal progres- sion, i.e. a process of sapienization from H. erectus to premodern H. sapiens and across the phylogenetic Rubicon to early modern human beings in Asia.
Fossil Evidence for Late-Pleistocene Human Evolution in Southern China
The Ziyang cranium from Sichuan discovered in 1951 at Huangshanxi was the first major fossil human find in China following the cessation of hostilities on the mainland in 1949 (57, 58, 92). Unfortunately, it is poorly provenienced, and its dating is problematical. A Paleolithic site in the immediate vicinity, however, has been dated to -30 kya (46), an appropriate age given the rela- tively archaic nature of the Ziyang specimen. The cranium, associated with an upper jaw showing advanced periodontal disease, is small but high-vaulted with a fairly well-rounded forehead and is thought to represent an older fe- male. Archaic features of the skull include noticeable sagittal keeling; an elongated frontal and foreshortened parietals; a distinct angular torus at the mastoid angle of the parietal; a relatively thick, robust occipital with a moder- ately well-expressed chignon; well-developed brows surmounted by a distinct ophryonic groove; and various cranial indices intermediate in value between premodern and recent Chinese.
A number of other sites in southern China have yielded relatively complete cranial specimens. The best preserved of these is the well-known Liujiang cranium from Guangxi that was discovered together with a nearly complete axial skeleton in 1957 (94). A Uranium-series date of 67 kya, based on associ- ated fauna, is often quoted for these remains (6), but once again questions of provenience make this age assignment questionable. A more likely association is with the lower cultural levels at the nearby Bailiandong cave site, dated to -30 kya, which has yielded a faunal assemblage similar to that seen at Liu- jiang, as well as some isolated human teeth (40).
The Liujiang cranium, while fully modem, is relatively robust and retains a number of archaic features in comparison with recent Chinese. The vault is low, bregma is situated posteriorly, the forehead slopes moderately backward,
and the brow is well expressed. As in nearly all recently discovered late-Pleis- tocene Chinese crania, there is a relatively well-developed occipital chignon. Racially, Liujiang shows typical Mongoloid features in the forward rotation of the anterolateral surface of the frontal process of the zygoma, a low simotic (nasal bridge) index, and possession of shovel-shaped incisors. Various other facial and nasal indices further ally the cranium with southem vs northern Chinese (139).
Recently a number of crania from the terminal Pleistocene or earliest Holo- cene have been recovered from Lijiang (131), Mengzi (134), Yaoguan (132), and Tanzigou (27) in Yunnan; Puding (Chuandong) in Guizhou (37, 108, 129); and Longlin (133) and Dalongtan (139) in Guangxi. The crania from Yunnan and Guizhou preserve many features similar to those seen at Ziyang, while the Guangxi material is highly reminiscent of Liujiang, which suggests that the preneolithic populations of southern China maintained a conservative cranial morphology until relatively recent times. Cluster analysis allies the Liujiang and Dalongtan crania with later southern Chinese Neolithic samples from Hemudu in Zhejiang, Hedong in Guangdong, Zengpiyan in Guangxi, and Tanshishan in Fujian (139), and clearly differentiates them from more north- erly Neolithic samples, which indicates continuity between late-Pleistocene and more recent populations in southern China. Similarities in nasal shape and indices and measures of overall craniometric distance indicate the close affini- ties of this southem Chinese complex to late-Pleistocene remains from Mina- togawa in Okinawa; Tabon in the Philippines; Niah Cave in Kalimantan, Borneo; and Wadjak in Java (1 18, 119), which suggests that the populations of southern China maintained genetic contact with Australasian people until rela- tively recently.
To sum up this section, there is at present no reason to suspect that the course of human evolution in China was fundamentally different from that observed for Africa, a region where modem human beings are postulated by many to have arisen. As in Africa, Chinese fossils that span the time from H. erectus to modem H. sapiens display a mosaic of transitional features that speak to a continual human presence in their continent of origin, uninterrupted by any major replacement of archaic by more modem people. In addition, there are a set of primitive features that, while not unique to East Asia, tend to link archaic, premodern, and early modem Chinese. Thus early modern speci- mens from China differentially preserve plesiomorphic cranial features such as laterally continuous supraorbitals (Laishui), an angular torus (Ziyang), thick vault bones, sagittal keeling (Huanglong), etc, not generally seen in early modem specimens from other regions of the world. This, in combination with the universal retention of derived midfacial and dental features from H. erectus to modem human beings in East Asia, is persuasive evidence for continuity in human evolution in China. It is unlikely, however, that East Asia was an isolated evolutionary cul-de-sac, cut off from contact with the outside world. Periodic increases in genetic contact between eastern and western people during the Pleistocene may in fact have been of decisive importance in trigger- ing the evolutionary changes that led to major transformations in the human fossil record both in China and in other parts of the Old World.
Human evolution in the East and West did not follow the same exact trajec- tory. Middle-Pleistocene hominids in China exhibit derived facial features considered by Smith et al (73) to be diagnostic of modem human beings (i.e. the frontal orientation of the medial part of the zygomatic and its lateral facies, a horizontal inferolateral zygomaticoalveolar margin, and a canine fossa), before their common occurrence further west. On the other hand, the modern- ization of the cranial vault and base seems to have occurred first in Africa and Europe. Approximately 300 kya these "Western" cranial vault and basicranial features, generally considered to be diagnostic of archaic H. sapiens, begin to appear in Chinese fossils, signaling the transition from H. erectus to premod- ern H. sapiens in East Asia. Somewhat later, the modem facial features men- tioned above begin to appear in Near Eastern and African late archaic H. sapiens. What is being documented is the mosaic, incremental emplacement of modern characters into both the East Asian and West AsianIAfrican gene pools, most likely the result of increased gene flow between these two central areas of human occupation during the middle-PleistoceneAate-Pleistocene transition.
The retention in East Asia of the diagnostic facial and dental features mentioned above, which are characteristic of all living and fossil Asians, refutes the notion that the transition from H. erectus to premodern H. sapiens in China was due to a simple replacement event, while the fact that such a transition occurred at all negates the idea that Asian H. erectus was distinct at the "species" level and far removed phylogenetically from other contempora- neous hominid lineages. The distinction between Asian H. erectus and West- em archaic H. sapiens is hence a false dichotomy. Middle-Pleistocene homi- nids should all be referred to H. erectus, or the latter taxon should be sunk into
H. sapiens (91). In the vernacular, middle-Pleistocene hominids from both the East and West can be simply called "archaic humans."
Demonstration of continuity in human evolution in Asia is not contingent on the persistence of discrete regional traits through time but on the documen- tation of a series of mosaic, morphological transformations, i.e. a process of sapienization from archaic to premodern and early modern human beings. Proponents of an African origin for modem human beings (75, 76) base their
claim on similar evidence, as well as the lack of Neandertal-like traits (i.e. autapomorphies) in the African material and the identification of certain frag- mentary specimens as geochronologically early representatives of anatomi- cally modern H. sapiens. East Asians likewise lack Neandertal-like autapo- morphies but in contrast with Africa, evolutionary continuity in Asia is further supported by the persistence of regional traits, particularly in facial and dental features. Coupled with new genetic evidence suggesting that human popula- tions have as deep roots in Asia as in Africa (83), there seems to be no reason to have a one-sided focus on one region or another as the sole area of origina- tion for modern people. It appears more likely that during the late middle+arly late Pleistocene transition a central "zone of sapienization" extended from Africa through the Middle East to East Asia. However, as in the case for early-Pleistocene Asian hominids, the supposition that Asia played a major role in modern human origins must be put to the paleontological litmus test of future fossil discoveries. Given the recent history of recovery of fossil human specimens in China, this may not be long in coming.
ACKNOWLEDGMENTS I take this opportunity to express my sincere thanks to Prof. Li Tianyuan for allowing me to participate in the study of the Yunxian crania. Profs. J. D. Clark, F. C. Howell, and T. D. White made much of my research possible, and I thank them for their support. I greatly appreciate the many opportunities I have had to exchange views with Chinese colleagues, including Profs. Jia Lanpo, Lii Zun'e, Wei Qi, Wu Rukang, Wu Xinzhi, Zhang Yinyun, and Zhou Guoxing, among many others. I thank Prof. Milford Wolpoff for his useful comments on drafts of this chapter. I would also like to acknowledge the financial support of the Committee for Scholarly Communication with China, the National Science Foundation (Grant # INT-9419529), the Henry Luce Foundation, the L. S. B. Leakey Foundation, and the Lowie Fund of the University of California, Berkeley, for support of travel and research related to the writing of this article. Special thanks are extended to Xu Yanna and Doug Beckner for graphics.
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