Fig. 3

Dated vegetal material (a-c) and results of the calibration using OxCal 4.437 and INTCAL202038 (d). (a) photograph of the wood sample from layer 2. (b) photograph of the wood samples from layer 3. (c) photograph of the leaf sample from layer 3. The wide range of calibrated ages for the older samples (ETH-142479 and RoAMS-5624.1) in layer 3 is due to the variability of the calibration curve39 methods.