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_   _  Acknowledgments _  ____ ___ Outline of geology___  __ ___ Classification of the volcanic rocks__  __ Mineralogy.   __ Plagioclase feldspar   ____ Alkali feldspar __   ____ Pyroxene.. _  _  ___ Olivine _ ___  Silica minerals..  Ironores___   __ Biotite   _ __ Hornblende ____ ___  Iddingsite..    Serpentine ____ ___   Calcite... _  Zeolites _ _ ___ __ _  Clay minerals _  Page  Cl 1  1 1 2  5 _ _  5  5 _  5  6  6  7  7  7  7  7  7 7 _  8 __.__.___ 8 Rock type Olivin Basall Hype] Andes Hypei Pyroc \ 1 r Chemical other ar Petrogenes Trace elen I. Trace References rsthene-bearing basalt-___ desite __ rthene-bearing andesite.___ ___ lastics__ ___  Water-laid tuffs and tuffaceous shales. __ __ Tuffaceous sandstones__ _ __ Pyroclastic conglomerate and breccia composition and comparison with rocks of eas_ ____  __ enesis  ments in the volcanic rocks of Guam, by Joshua y, Jr., and John T. Stark-

Petrology of the volcanic rocks of Guam, with a section on trace elements in the volcanic rocks of Guam