The234U238U ratio in diatom oozes from South West Africa shelf is as high as 1.175±0.008 being slightly lower in enclosed phosphatic nodules - 1.163±0.005 and still lower in similar nodules from Chile shelf - 1.143±0.008. The absolute age calculated after these data is (24(±27)·103years for the South West African nodules and 55(±35)·103years for the Chilean nodules. © 1972.
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