Because the calibration curve is very flat at 10000 BP, perhaps even rising a little, all radiocarbon dates of this range are increased after calibration by at least 200-300 years. For example, given a deviation of only +/-50 years, 10000 BP corresponds to 9660-9380 BC. The radiocarbon dates of Dhra’ clearly reflect this plateau (as do those of Hallan Çemi). The dates for Structure 1 (Σ: 9670-9390 BC) and for the Trank Trench (Σ: 9760-9390 BC) fall within this time range. It is therefore impossible to separate them chronologically. However, they are all earlier than the Mureybetian, and contemporary with the late Natufian/early Khiamian layers of Mureybet^[1] and Hallan Çemi. Only Structure 4 is slightly later, around 9400-9250 BC, and thus contemporary with the early Phase III-East of Jerf el Ahmar

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