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Sediments accumulate in the Santa Barbara Basin relatively rapidly: ,about 3-4 mm yr-' based on the analysis of varves. These deposits are ideal for studying the applicability of nuclear geochronological techniques in a natural situation. Studies of the depth distribution of several radionuclides, manmade 65Fe and naturally occurring "Pb and Th isotopes, in recent Santa l3arbara sediment layers permit an evaluation of the geochemical behavior of Fe, Pb, and Th in coastal waters and have established the usefulness of "Fe and ""Pb for dating coastial or near coastal sediments deposited during the last decade and halfcentury Gspectively.

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