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Puntan Cresta – near Merizo, this picturesque mountain is the result of Guam’s second era of eruptions

Limestone cliff at edge of ocean, right, has been severely cut by action of waves against it through the years

An outcropping of limestone overlying the volcanic basalt hills south of Agat (near Mt. Lamlam) is vivid evidence of Guam’s underwater origin. – Stone Photo

A story from Paul B. Souder of Guam’s scientific birth