On the Origins of Decorative Traditions in the Early Bronze Age Pottery of the Middle Tobol Basin, Western Siberia

The Early Bronze Age is one of the least documented stages in the prehistory of the Middle Tobol region. The key issue in the study of this period concerns the origins of several cultural traditions and the role of the native Chalcolithic population in this process. The analysis of pottery decoration from the Bairyk-Lybayevo Chalcolithic sites reveals cultural heterogeneity, evidently reflecting the immigration of tribes, unrelated to local tribes, and their contacts with the natives. Two tendencies can be traced in this process. The first is a gradual transformation of separate decorative components of the Bairyk-Lybayevo complex. These components are detached from the main complex and are represented by pottery from sites of the Imbiryai and Mostovoye types. The second is an abrupt change caused by intense contact with the immigrants, eventually resulting in the emergence of the Tashkovo culture.