and human heads engraved in pottery, the Samus culture also produced ceramic phalli and animal heads. Members of the nearby Susgun culture produced humanoid figures in bone. The only artistic products of the late Bronze Age are early South Siberian deer stones, stone steles decorated with images of deer, which were subsequently imitated by Scythian art. The early Iron Age animal style of the south Siberian horse nomads only influenced the cultures of the west Siberian lowlands a little. An entirely unique style was developed by the Kulaika culture and its neighbours in the middle and lower Ob. Here bronze figures of animals and people were manufactured, in which eagles and bears played a particularly important role. Architecture The predominant building material in prehistoric north Asia was wood; stone was used for foundations at most. Most houses were tight structures, sunk less than 1 metre into the earth and had a rectangular or circular ground plan; oval or polygonal ground plans occur rarely. The structure of the roofs may have been pitched wooden constructions or saddle roofs. In many cultures, a small, corridor-like porch was built in front of the entrance. One or more hearths were found in the inner house. Floodplains and lakesides were the preferred settlement locations. Settlements could take entirely different forms in different cultures; small groups of houses, large unfortified settlements, fortified city-like settlements and elevated fortress complexes are all found. Small village-like groups of houses are found in great numbers in all the sedentary cultures. In some cases, such as the chalcolithic settlement of Botai on the Ishim river, settlements experienced substantial expansion. It was not unusual for larger settlements to have walls and extramural graveyards, as in the case of the west Siberian settlements of Sintashta and Tshitsha. The inner space of these city-like settlements was densely and regularly packed with rectangular houses, indicating a form of town planning. The fortified settlements in elevated locations, like those located in the Minusinsk Hollow and Khakassia in the bronze and Iron Ages are usually distinguished from these settlements by their small size. Their purpose is still unclear; they may have been temporary refuges, the seats of elites, or sanctuaries. Society Unlike the nomadic groups of earlier times and of northeastern Siberia, complex social structures can be detected in sedentary groups in West Siberia in the early Bronze Age. Their existence is indicated by the city-like settlements