Trade on an impressive scale and covering large distances continued during the Chalcolithic (c. 4500-3300 BCE). Obsidian found in the Chalcolithic levels at Gilat, Israel have had their origins traced via elemental analysis to three sources in Southern Anatolia: Hotamis Dağ, Göllü Dağ, and as far east as Nemrut Dağ, east of the other two sources. This is indicative of a very large trade circle reaching as far as the Northern Fertile Crescent at these three Anatolian sites.