Radiometric Ages of Pleistocene Terraces from San Nicolas Island, California
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.).