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.
The period Göbekli Tepe was built in is addressed as the Pre-Pottery Neolithic (PPN) after one of its main cultural traits, the absence of pottery vessels (there are clay figurines later in the PPN, however).
The general chronological division for the Early Neolithic was developed in the Southern Levant, by Kathleen Kenyon on the basis of the stratigraphy of Jericho.
However, the criticism of ABA and application of a more aggressive oxidizing method, such as wet oxidation (ABOX) or cellulose extraction, might only be needed in some special cases, for example, in the case of poorly preserved or chemically treated wood.
Separation of cellulose seems to be the ultimate solution; however, it is not always applicable when samples contain small amounts of wood.
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.They clearly show that the site was in use beginning from the PPN A and into the PPN B.A closer examination of the points reveals, however, that characteristic forms of the latest PPN B are missing.She observed a fundamental distinction in the ground plans of buildings – round constructions in the earlier PPN A, rectangular buildings in the later PPN B.She further based her subdivision on differences in the material culture.