The American Journal of Science, Band 272

America Bull andesitic Appalachians assemblages basalt basement basin belt biotite boron calculated Cambrian Canada Geol carbonate channel chemography clastic complex composition concentration continental margin Cordillera crust crystalline crystallization curve dates deformation deposition diopside dome equilibrium facies fault feldspar figure flow fluid fo ss folds foliation formation forsterite Geology Geophys geosynclinal glaucophane gneiss grains granite graptolites graywacke H₂O igneous indicate invariant points island arcs isotopic Jour K-Ar layer limestone lithosphere magmatic magnetite mantling rocks Martinsburg Mesozoic metamorphic rocks mica minerals Mountain North oceanic ophiolitic Ordovician orogeny Paleozoic Pegmatite percent Petrology phase phlogopite plagioclase plate plutonic pollen Precambrian pressure quartz range ratio Rb-Sr reaction regional metamorphism relations Ridge samples sandstone schist sedimentary sediments sequence shale siderite silicates SiO2 slope solid solution southern stratigraphic structure subduction Taiwan tectonic temperature thick thrust tion univariant viscosity western zone