These differences are most obvious in a certain find category: projectile points.
This refilling is fascinating in regard to the enclosure’s functions but poses severe problems for the dating of Layer III using the radiocarbon method, as organic remains from the fill-sediments could be older or younger than the enclosures, with younger samples becoming deposited at lower depths, thus producing an inverse stratigraphy.
Another issue is the lack of carbonized organic material available for dating; only in the last campaigns have larger quantities been discovered.
Given these inherent difficulties, in a first approach the attempt was made to date the architecture directly using pedogenic carbonates.
They sometimes also have pillars that are much smaller than the older ones however.
Projectile points from Göbekli Tepe include PPN A types like el-Khiam, Helwan and Aswad points; regarding the PPNB, Byblos and Nemrik points are very frequent, Nevalı Çori points are rare.