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Nature 453, xi (29 May 2008) | doi:10.1038/7195xia; Published online 28 May 2008

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Making the paper: Martin Kennedy

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Cause of most abrupt historic climate change identified in rock deposits.

Martin Kennedy has been examining cap carbonates — layers of sedimentary rocks that overlay glacial deposits from around 635 million years ago — since 1990, when he was a graduate student at the University of Adelaide in Australia. "It probably seems strange that you can study a couple of metres of rocks like this for close to two decades," laughs the geologist, who is now based at the University of California, Riverside.

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