Carbon-14 Trends in Subfossil Pine Stubs

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Science  28 Nov 1969:
Vol. 166, Issue 3909, pp. 1143-1145
DOI: 10.1126/science.166.3909.1143


Subfossil pine stubs from a peat bog in the Netherlands were linked together dendrochronologically and sampled at intervals of 30 or 50 years for carbon-14 analysis. The results suggest that the carbon-14 content of the atmosphere was not changing between about 5400 and 5100 B.C., but that it was increasing slightly about 800 years earlier.

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