Table 1. Radiocarbon dates obtained for core TUL99B03. Results are reported in years before present (BP), as well as calibrated years BP (cal BP). As can be expected, the calibrated results increase the uncertainty of the date. Dating and calibration was carried out by the Isotrace Laborabory at the University of Toronto in comparison with the dendrochronologically derived INTCAL98 dataset for terrestrial material (Stuiver and Braziunas 1993; Stuiver et al. 1998).