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Retrogressive Metamorphism and Phyllonitization Pt I
II Granites of Eastern North
Radioactivity of Stone Mountain Springs
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alkali feldspar anal analysis andesine Anisozygoptera arkose average composition axial angle basalt basanites base beds biotite calculated composition cent chemical cross-vein crystals deposits described determined developed diaphthoritic drift Durham basin elytron erosion evidence feet folding formation foshagite fossil genus geoid Geol Geological Survey Geology glacial glass gneiss grains gravity groundmass hindwing Hiva Oa iddingsite Illinoian Illinois indicate insects interstitial Iowan isostasy isostatic Jour Keyes analyst lavas limestone loess margin Marquesas masses material metamorphism miles minerals mylonitization nephelite nodus observed occur Odonata olivine optical properties origin oxide pacificite paper Pennsylvanian Permian phenocrysts Phenocrysts:—Olivine phonolite phyllonite plagioclase posterior present Protodonata pyroxene quartz quartzite refraction refringence region rock sandstone Sc.—Fifth Series schist sediments shale silicates solid solution species specimen strata structure sub-basalts surface thickness Tillyard tion trachyte Triassic trough valley vein venation Washington analyst wing Wisconsin zone