Wheeler centre dating
First, this stratigraphic dating technique can only be applied to a site that has formed in identifiable layers; this criterion excludes many sites in North America.
It also cannot be used on large-scale projects, and leaves no opportunity for re-excavation by future archaeologists using improved techniques.
It is organised by the Leiden University and the Netherlands National Museum of Antiquities.
The mound is situated in Syria about 30 kilometres from the Turkish border.
It has been carried out under the leadership of Professor Peter Akkermans since 1986.
Tell Sabi Abyad seen from the west, with the excavation in progress.