C-14 dating of plant macrofossils in lake sediment

Andree, Michael; Oeschger, Hans; Siegenthaler, Ulrich; Riesen, Trudi; Moell, Markus; Ammann, Brigitta; Tobolski, Kazimierz (1986). C-14 dating of plant macrofossils in lake sediment. Radiocarbon, 28(2A), pp. 411-416. Arizona Board of Regents, University of Arizona 10.1017/S0033822200007529

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Macrofossils of terrestrial plants have been picked from a sediment core taken in Lake Lobsigen, a small lake on the Western Swiss Plateau. The sediments were previously analyzed for pollen composition, plant and animal macrofossils, and stable isotopes. Plant macrofossils were selected near pollen zone boundaries in Late Glacial and early Postglacial sediment for C-14 dating by AMS. In the same lake carbonate and gyttja (aquatic plant) samples were dated by decay counting. The dates on terrestrial material are generally younger than those on carbonate and gyttja, ie, material reflecting the C-14/C ratio of dissolved bicarbonate in lake water. This is probably due to a contribution of dissolved limestone carbonate and thus a somewhat reduced C-14/C, ratio in the lake's water (hard water effect).

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