This paper discusses the nature of Dalma and Pisdeli cultures, their regional and interregional interactions and expansions in 5th millennium BC. It discusses old and new excavations and surveys as well. According to the importance of the material from these periods found at newly-excavated sites such as Kul Tepe Jolfa, Dava Göz Khoy, Lavin Tepe, and Qosha Tepe, we briefly describe the main stratigraphic and material data from these sites. Old and new data from excavations and surveys eventually lead us to a new chronological table for the 5th millennium BC in north/western (NW) Iran. The implications of the finds are discussed along with their limitations and future research directions.
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