The potassium-argon method of geo-chronometry has been modified to enable the dating of young, normal volcanic rocks. It has been applied to the dating of the posterosional volcanics of the Honolulu Series, which include such well-known Hawaiian landmarks as Diamond Head and Punchbowl. Ages vary from about 30,000 yrs for the Koko rift zone lavas to about 800,000 yrs for the oldest member measured (Castle flow).

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