Zab basin is located in the south part of Urmia Lake. The little Zab River in northwestern Iran rises from the mountains Piranshehr and flows from the northwest to the southeast direction to join Iraq from Alan passage. Based on Hasanlu research project in Ushnu- Solduz valley, there is a gap between Hasanlu VIII/Pisdeli and Hasanlu VII, wich can be linked to Early Trans-Caucasian II-III in the north Urmia Lake basin. At the end of the Pisdeli period, there is an abandonment of the many small sites in Ushnu-Solduz valley. In recent archaeological studies in Little Zab basin, Beveled-rim bowl pottery was found in five sites in the Zab basin. This pottery is not seen in the northwest of Iran yet. Beveled-rim bowls for the first time appeared in southern Mesopotamia in the early fourth millennium and by the mid-fourth millennium in the surrounding regions, declining to extinction by 3000 BC. Their trajectory coincides with the Uruk period. For this type of pottery various meanings are proposed depending upon where they were found. If we consider this pottery as the late Uruk period, that belongs to the late fourth millennium BC. There are not big settlements like south of Mesopotamia in the fourth millennium, in this area. And it’s because of the environment that does not allow to the formation of these settlements. Probably these sites are connective points of trade network, Beveled-rim bowls as the late Uruk period that is late fourth millennium BC, at this time we see social complexity accelerating in the Middle East. Geographical position and Settlement pattern, Signs of Commercial and cultural relation of the North-Western Iran Society and northern Mesopotamia in late Chalcolithic. Based on evidences it can be proposed that after Pisdeli period, Uruk culture is continuity, which is contemporary with northern Mesopotamia. Now, if based on prehistoric chronology of Sulduz plain and the south of Urmia Lake basin, we consider for Dalma Culture a history about 4000-500
