Figure 2.

Radiocarbon and stable carbon isotopes data from olive wood. (A) A consecutive series of thin sections was sampled through an olive wood radius (96 samples in total) ranging from 1957–1971, a time period in which the “bomb peak” of increased atmospheric ¹⁴C can be used as reference (wide purple line). Olive wood samples from which α-cellulose was extracted and radiocarbon dated are indicated in black. As a control, a number of α-cellulose samples extracted from the latewood of pine growing in the same field as the olive tree were also analyzed for ¹⁴C and are marked in red. Results have been compared to the ¹⁴C calibration curve using OxCal v 4.2³¹ with the Bomb 13 NH2 calibration curve. (B) δ¹³C values for α-cellulose of all olive wood samples dated. The demarcation between years (light gray to dark gray) was evaluated according to minimum δ¹³C values and is aligned to the ¹⁴C data. (C) Radiocarbon calibrated years (modeled by OxCal 4.2) between dashed white lines and years according to δ¹³C variation pattern between blue markers.