The ages of coral skeletons from three localities on San Nicolas Island, California, have been estimated by uranium series methods. Two localities are on a low terrace and their radio-metric ages of 120,000 ± 20,000 and ≥ 120,000 years B.P. suggest that this terrace is roughly contemporaneous with the Palos Verdes sand and correlative mainland terraces. One locality from a high terrace that contains an extinct faunal element yielded a significantly older age (>200,000 years B.P.).

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