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Samples from Sites 320 and 321 show moderate amounts of acidic (rhyolitic) volcanic materials in the late Miocene to Recent and sparse, apparently also acidic, debris in the early Miocene to Eocene. The former originates from the Peruvian rhyolites and the latter possibly comes from the East Pacific Rise. Mineralogically the samples are dominantly glass-feldspar (including K-feldspar in conspicuous amounts) biotite, with only minor hornblende, clinopyroxene, and orthopyroxene. Two occurrences of muscovite (evidently volcanic) are noteworthy. Authigenic minerals of significance include abundant phillipsite, much coexisting with glass, and one occurrence of a hexagonal prism of quartz.

Tertiary Explosive Volcanic Activity in the Eastern Equatorial Pacific Ocean: Sites 320 and 321, DSDP Leg 34