Age-depth relationship of ¹⁴C-dated samples.

<p>Calibrated radiocarbon dates are plotted by depth (estimated as midpoint of excavation spit). Blue dashed-line boxes indicate portions of the stratigraphic sequence with no dated specimens. Yellow bars indicate temporal spans with no measured radiocarbon dates. Dates calibrated using OxCal v.4.2 software [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0192029#pone.0192029.ref065" target="_blank">65</a>] and a combined IntCal13/SHCal13 calibration curve [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0192029#pone.0192029.ref066" target="_blank">66</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0192029#pone.0192029.ref067" target="_blank">67</a>]. The insert shows the youngest dates from Spits I-II.