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.