Carbon-14 trends in subfossil pine stubs.
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.
Vogel
J C
JC
Casparie
W A
WA
Munaut
A V
AV