The Origins of the Bronze Age of Southeast Asia

White and Hamilton (J World Prehist 22: 357–97, 2009) have proposed a model for the origin of the Southeast Asian Bronze Age founded on seven AMS radiocarbon determinations from the Northeast Thai site of Ban Chiang, which would date the initial Bronze Age there to about 2000 BC. Since this date is too early for the derivation of a bronze industry from the documented exchange that linked Southeast Asia with Chinese states during the 2nd millennium BC, they have identified the Seima-Turbino 3rd millennium BC forest-steppe technology of the area between the Urals and the Altai as the source of the Southeast Asian Bronze Age. We challenge this model by presenting a new chronological framework for Ban Chiang, which supports our model that the knowledge of bronze metallurgy reached Southeast Asia only in the late 2nd millennium BC, through contact with the states of the Yellow and Yangtze valleys.     

Ban Chiang and Northeast Thailand; the palaeoenvironment and economy

Beginning with a detailed presentation of the faunal spectra from Ban Chiang and related sites in Northeast Thailand, this essay reconstructs the palaeoenvironment during the period 3500 BC to the end of the prehistoric period. The evidence from the freshwater molluscs found in prehistoric layers suggests that the first occupants of Ban Chiang encountered a habitat with permanent lakes and clear, slow moving streams. Since the lakes contracted in the dry season, there were ideal conditions for practising wet swidden agriculture. From c. 1600 BC, the presence of water buffalo and associated changes in the faunal spectrum suggests the inception of wet rice cultivation. Such agricultural intensification, it is held, follows population pressure and accounts for subsequent settlement in the more arid plains of Thailand.     

The bovid third phalanx and prehistoric ploughing

Plough agriculture is the basis of southeast Asian rice cultivation, and has profound social implications. Yet little if anything is known of its development in prehistory. In the absence of fossil fields, remains of ploughshares or of ploughing scenes, attention is focused on the bones of potential draught animals. A multivariate analysis of exostosis development in the third phalanx indicates that cattle at the site of Ban Chiang were gracile, while water buffalo were as robust as modern draught animals.