Potassium-argon Ages from the Pololu Volcanic Series, Kohala Volcano, Hawaii

Potassium-argon ages on five lava flows from the Pololu Volcanic Series, thought to be among the oldest rocks exposed on the island of Hawaii, indicate that the main subaerial shield-building phase of Kohala Volcano occurred about 0.7 ± 0.15 m.y. ago and that most of the island was formed within the past 0.7 m.y.