Pleistocene Age Determinations from California and Oregon

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Science  20 May 1966:
Vol. 152, Issue 3725, pp. 1091-1092
DOI: 10.1126/science.152.3725.1091


Mollusks have been collected from Pleistocene marine deposits at Tomales Bay, California, and Cape Blanco, Oregon. Dating by the carbon-14 and thorium-230-uranium-234 methods suggests that the shells are at least 33,000 years old. The more probable age of the Tomales Bay locality is ≥ 50,000 years.