Geology of the Southwestern Part of the Ramona Quadrangle, San Diego County, California

abundant aggregates albite amount apatite aplitic approximately assimilation augite average bands batholith biotite Bonsall tonalite calcic California cent contacts crossed nicols crystals dark inclusions deposition distribution emplacement equant evidence feldspar ferromagnesian Figure flakes foliation footnote gabbro garnets Geol Geology gneiss gneissoid structure granitic granodiorite gray Green Valley tonalite hornblende hornblende gabbro hypersthene igneous rocks injection gneiss intrusions irregular Julian Lakeview tonalite Larsen Luis Rey Quadrangle magma magnetite mapped Mesa mica microcline miles muscovite myrmekite nearly norite occurs olivine orthoclase pale parallel pegmatites Peninsular Range Petrography phases plagioclase planes Plate pleochroic poikilitic Poway Poway conglomerate pyroxenes quartz diorite quartz grains quartzite Ramona Quadrangle region rock types San Diego County San Luis Rey San Marcos gabbro schist schistosity sediments silica sillimanite Stonewall quartz diorite Stonewall rocks stoping streaks texture thick thin section tourmaline veinlets Volcan Mountain widespread Wolford granodiorite Woodson granodiorite zircon zones