Additional Supporting Information may be found in the online version of this article.

JQS_1498_sm_Suppl-Fig-S1.eps647KFigure S1: The final P_Sequence age model used in this study. The model was generated using OxCal v4.1 (Bronk Ramsey, 2009) and the IntCal09 calibration set (Reimer et al., 2009) (full details in main text). The model displays highest probability density functions for the radiocarbon dates, major lithostratigraphic boundaries, and tephra age estimates. Boundaries were placed where the major shifts in lithostratigraphy were identified (Bronk Ramsey, 2008 – see main text for reference) The age model indicates rapid sedimentation throughout GI-1 (690 to ca. 600 cm) and then a sharp reduction in sediment accumulation rate in the early part of GS-1 (600-575 cm). Rapid sedimentation was re-established in the second half of GS-1 and continued into the early Holocene (552-500 cm), but the model is poorly constrained in this part of the sequence in contrast to the well constrained model for GI-1.
JQS_1498_sm_Suppl-Table-S1.doc36KSupplementary Table 1
JQS_1498_sm_Suppl-Table-S2.doc82KSupplementary Table 2

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