A typology of polished stone axes in the middle Yellow River and their impact on early complex societies

Polished stone axes have long been recognized as essential tools directly related to logging and wood processing in sedentary societies, playing a crucial role in prehistoric people's survival and social production. Their evolution as production tools has been a driving force behind the advancement of society's productive capacities. In this article, information and data on stone axes from the middle Yellow River region are systematically compiled, presenting a typology based on 640 stone axes from 153 sites spanning the Middle Neolithic to the Bronze Age. The main conclusions derived from the study are as follows: (1) Typological study reveals that stone axes can be classified into 7 types. By examining the evolution of these types and their combinations, four distinct phases in the development of stone axes are identified, reaching its peak during the middle stage of Phase 4. (2) The flourishing of the stone axe types originated in the Yangshao period in the Guanzhong Plain. With the development of social complexity and the establishment of the Xia and Shang dynasties after the Longshan period, the center of gravity of stone axe types and assemblages gradually shifted to the Central Plains and the Fen River Valley. Finally, the genealogy spread to the eastern foothills of the Taihang Mountains and declined. (3) The types of stone axes from the late Yangshao period and the middle and late Longshan periods exhibit a clear shift, highlighting their functional differentiation during these periods. (4) The production of stone axes can be categorized into two modes based on the raw stone material used: (a) and (b). The metallization of tools, even during the so-called Bronze Age, experienced significant delays, and it was only during the Yinxu era that bronze axes began to replace some of the stone axes produced in mode (b). (5) The functional differentiation of axes and the transformation of the mode of production have played a role in inducing the emergence of social complexity and expediting its development to some extent.