Petrographic analysis of 30 sandstone samples from the Cretaceous Kodiak Formation indicates that they consist mainly of intermediate to basic volcanic and plutonic detritus derived from a source area east of Kodiak Island. This source area had extensive volcanic cover with rare exposure and weathering of cogenetic plutons. The petrology of the Kodiak Formation is similar to that of related rocks in the Alaskan Peninsula and is indicative of the longevity of the volcano-plutonic source area.

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