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Phosphorites on the Peru shelf occur mainly as dark and dense conglomerate (“Diphosphates) and occasionally as soft, friable (“F”-phosphatcs) protocrusts, which appear as laterally extensive, centimeter–thick plates of bored, pbosphatized sediment. Several undisturbed and well–documented samples of these protocrusts were collected by box coring and submersible operations during an expedition of the R/N Seaward Johnson in 1992. Three of these crusts were analyzed in layer-by-layer fashion for U-series isotopes, while two were analyzed for AMS-14C. and stable carbon isotopes. Unlike the D-phosphates, which may show a progressive decrease in their δ13C values (from 0...

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