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Comparison of 18 O P values from Barberton sediments with modern marine phosphates 7,8 and igneous phosphates 9,10. RE Blake et al. Nature 464 , 1029-1032 (2010) doi:10.1038/nature08952.
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Comparison of 18OP values from Barberton sediments with modern marine phosphates7,8 and igneous phosphates9,10. RE Blake et al.Nature464, 1029-1032 (2010) doi:10.1038/nature08952