Abstract

A late Pleistocene surf-cut platform with a shoreline angle elevation of 28 feet above high-tide level is present on West Anacapa Island, California. The platform is covered by a sequence of marine and nonmarine deposits containing the remains of marine and terrestrial invertebrates, terrestrial vertebrates, and shore birds. A marine sandy conglomerate on the platform is overlain by talus; unconformably overlying this talus is a supralittoral beach deposit, consisting of gray sand, in turn over-lain by another talus deposit. The cutting of the platform and deposition of the rock sequence resulted from eustatic fluctuations of sea level. The platform, marine conglomerate, and lowest talus deposit are correlated with the Garanon Member of the Santa Rosa Island Formation; the supralittoral sand and talus are correlated with the Tecolote Member. These rocks were probably deposited during the Sangamon interglacial and Wisconsin glacial times respectively.

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