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For example, archaeologists should now be able to pinpoint more accurately the timing of the extinction of Neanderthals or the spread of modern humans into Europe.

At the Oxford Radiocarbon Accelerator Unit, Professor Christopher Ramsey with his doctoral student Richard Staff and chemist Dr Fiona Brock worked with two other radiocarbon laboratories (the NERC facility at East Kilbride, Scotland, and Groningen in the Netherlands) on the radiocarbon record from the lake.

The oxidation of humus within river and lake sediments also releases CO2 for uptake by mollusc populations.

Organic or metabolic carbon comes from marine or terrestrial plant material, including diatoms and protozoa, kelp and phytoplankton, or humus and peat added to estuaries and rivers (Keith, Anderson and Eichler, 1964; Tanaka, Monaghan and Rye, 1986; Little, 1993).

Inorganic carbon comes from ocean water bicarbonate (which has a d13C value of close to -2 per mille wrt PDB), atmospheric carbon dioxide (-7 per mille) and fresh water bicarbonate (usually less than -8 per mille) (Keith et al., 1964).

This research is part of a large international research team, led by Professor Takeshi Nakagawa of Newcastle University, studying the cores for clues about past climate and environmental change.

Radiocarbon is continuously produced in the upper atmosphere.




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