Many of the raw materials found at the site had to be brought in from distant sources. Obsidian, which was locally available in large quantities, seems to have been an important mechanism to establish trade relationships outward from Catal Huyuk. This phenomenon was represented by a distinct style of pottery and an assemblage of stone tools. With the elaboration of pottery styles, a new phase is recognized by 5600 B.C., the Samarran. It is at this time that stamp seals can be found.
Stamp seals suggest private ownership.
It is clear that craft specialists also are emerging as a well established part of Samarran lifeways. Shortly thereafter, a new phase known as the Halafian became more widespread. Construction techniques improved in buildings and cobbled streets between houses were constructed. The need for some form of centralized control must have been present as population dynamics changed. There was increased urbanization and concentration of wealth based on a mercantile trade during this period.