Xinjiang:A craniometric investigation of the Bronze Age settlement

A craniometric investigation of the Bronze Age settlement of Xinjiang

American Journal of Physical Anthropology (Early View)
Horse-mounted invaders from the Russo-Kazakh steppe or agricultural colonists from western Central Asia? A craniometric investigation of the Bronze Age settlement of Xinjiang
Brian E. Hemphill, J.P. Mallory
Numerous Bronze Age cemeteries in the oases surrounding the Täklamakan Desert of the Tarim Basin in the Xinjiang Uyghur Autonomous Region, western China, have yielded both mummified and skeletal human remains. A dearth of local antecedents, coupled with woolen textiles and the apparent Western physical appearance of the population, raised questions as to where these people came from. Two hypotheses have been offered by archaeologists to account for the origins of Bronze Age populations of the Tarim Basin. These are the steppe hypothesis and the Bactrian oasis hypothesis. Eight craniometric variables from 25 Aeneolithic and Bronze Age samples, comprising 1,353 adults from the Tarim Basin, the Russo-Kazakh steppe, southern China, Central Asia, Iran, and the Indus Valley, are compared to test which, if either, of these hypotheses are supported by the pattern of phenetic affinities possessed by Bronze Age inhabitants of the Tarim Basin. Craniometric differences between samples are compared with Mahalanobis generalized distance (d2), and patterns of phenetic affinity are assessed with two types of cluster analysis (the weighted pair average linkage method and the neighbor-joining method), multidimensional scaling, and principal coordinates analysis. Results obtained by this analysis provide little support for either the steppe hypothesis or the Bactrian oasis hypothesis. Rather, the pattern of phenetic affinities manifested by Bronze Age inhabitants of the Tarim Basin suggests the presence of a population of unknown origin within the Tarim Basin during the early Bronze Age. After 1200 B.C., this population experienced significant gene flow from highland populations of the Pamirs and Ferghana Valley. These highland populations may include those who later became known as the Saka and who may have served as middlemen facilitating contacts between East (Tarim Basin, China) and West (Bactria, Uzbekistan) along what later became known as the Great Silk Road.
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It appears that neither Han Chinese nor steppe populations played any detectable role in the initial establishment or subsequent interregional biological interactions of Bronze Age Tarim Basin populations.
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This research confirms that populations from the urban centers of the Oxus civilization of Bactria played a role in the population history of the Bronze Age inhabitants of the Tarim Basin. Yet these Bactrian populations were not the direct, early colonizers envisioned by advocates of the Bactrian oasis hypothesis (Barber, [1999]). None of the analyses document the immediate and profoundly close affinities between colonizers and the colonized expected if the Tarim Basin experienced substantial direct settlement by Bactrian agriculturalists.
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This study confirms the assertion of Han ([1998]) that the occupants of Alwighul and Krorän are not derived from proto-European steppe populations, but share closest affinities with Eastern Mediterranean populations. Further, the results demonstrate that such Eastern Mediterraneans may also be found at the urban centers of the Oxus civilization located in the north Bactrian oasis to the west. Affinities are especially close between Krorän, the latest of the Xinjiang samples, and Sapalli, the earliest of the Bactrian samples, while Alwighul and later samples from Bactria exhibit more distant phenetic affinities. This pattern may reflect a possible major shift in interregional contacts in Central Asia in the early centuries of the second millennium B.C.
Update:
Some data on the people from the earliest cemetary of Qäwrighul (2300-1430 B.C.):
Males had skulls 183mm long and 137.9mm wide (mesocranic, CI=75.4)
They were broad-faced (bizygomatic 136.2, upper facial height 66.5, UFI=48.8)
The had rather short mesorrhine noses (50.9x26.2mm).
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