High-resolution accelerator-mass-spectrometer radiocarbon dating was performed on late-glacial macrofossils in lake sediments from Kodiak Island, Alaska, and on shells in marine sediments from southwest Sweden. In both records, a dramatic drop in radiocarbon ages equivalent to a rise in the atmospheric C-14 by similar to 70 parts per thousand coincides with the beginning of the cold period at 11000 yr B.P. (C-14 age). Thus, our results show that a close correlation between climatic records around the globe is possible by using a global signature of changes in atmospheric C-14 content.
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