Text S8. Foraminifera analysis
Fifteen samples at no more than 4 m vertical increments and twenty-six subsamples at no more than 0.1m vertical increments were selected for foraminifera analysis from KHQ-14 and KhqS, respectively. Samples were prepared using standard preparation techniques including drying, hydrogen peroxide digestion, and washing through a 63-μm-sieve. Foraminifera were identified and expressed in concentration form.
Foraminifera remains enumerated from seven subsamples above -11.0m OD, post ca. 8,450 cal BP, of KHQ-14 (14 taxa in total, 11 identified to species level) are mainly associated with brackish water conditions (Fig. 3), with counts dominated by the euryhaline, benthic taxonAmmonia tepida . Foraminifera remains are absent below -11.0 m OD, prior to ca. 8450 cal BP, although their undifferentiable chitinous linings are found in varying abundances down to ca.9,000 cal BP. Eleven subsamples from KhqS yielded 7 species foraminifera (Fig. 2c). All samples come from U4, representing an abrupt change of brackish water conditions.